My bias against Fortnite comes from a WAY more personal anger towards Epic Games, but never let it be understated how much they only care for money. Not only does Fortnite go through regular crunch time to get massive amount of content out to rake in the cash that devs barely see much of, but the game is designed around making everyone think they are a winner. If you are winning/doing well in the majority of your games, you have less matches but see lots of success; if you aren't winning a lot /doing poorly, you get into so many matches so quickly that the feel of failure barely stays and you will inevitably have a more successful match or two without ACTUALLY improving at the game overall. Considering that this game heavily appeals to children, this manipulates players into thinking they are really good at the game regardless of whether they are, and people tend to enjoy games they think they are good at and spend more time and money on them...and doing this to children feels very exploitative of their naivety.
Originally I didn't like the game for these reasons and because it originally launched with only the one mode and a paid other mode that no one really cared about, which to me felt like gutted content as someone who was used to playing many FTP FPS/TPS that had many different modes to select from. However they have rectified this issue now with offering essentially Team Death Match and other modes that are seemingly permanent additions as well as rotating game modes, and honestly some of the content they add that isn't just a skin or a dance I find to be acceptable.
However, they can never escape the fact that the reason for Fortnite's success stands on the the graves of betrayal to both another company they were working with and their own players's trust. From what I researched a couple of years ago, Bluehole (who owns PUBG) went to Epic Games to pay to use Unreal Engine and assets to make PUBG. This means they would have to tell them what they were attempting to make and come to a deal, which they did. However, Epic Games loved the idea of a battle royale so much that they basically screwed over Bluehole by being a company with way more money and assets and turning Fortnite into what it is today. See, originally Fortnite was a failed idea of what I believe was just a wacky-looking tower defense/fort defense game that would have played similar to Borderlands, but it was deemed a failure of an idea and was killed. When Epic Games got wind from Bluehole about PUBG, they took that dead project and ripped the idea of a battle royale and made Fortnite what it is now, with the original art style that is kid-friendly, some small changes like making it a TPS and adding a building mechanic from the original Fortnite concept, and making it FTP because they could afford it while Bluehole HAD to make PUBG have an entry fee to afford the investment they made being a smaller company at the time.
This essentially almost gutted PUBG entirely and shot Fortnite up to where it is today: ripping off someone else's idea and making it in such a way that it kills the competition of the company you just contracted with and appeals to children to manipulate them into begging their parents for money. Fortunately, from what I've heard and seen, PUBG has seen serious success in the face of all of this, yet no where NEAR what Fortnite has or what could have been had they not been so scummy.
Now, for my bias and anger...
I was a HUGE fan of Paragon. If you don't know that game, I'm not surprised, but it was essentially a third-person MOBA (similar to Smite) that was on PC and PS4 and made every other MOBA look like trash in terms of graphical fidelity as well as combining the elements of MOBAs that worked while also adding just a dash of their own spin to make things fun and unique. I plugged hours into this game, playing it before and after work nearly every day. I subscribed to so many channels, talked in their official forums, attended dev streams...I jumped into this game hardcore!
Unfortunately, Epic Games once again showed their inability to make something original and make good decisions with it, because they then introduced a brand-new map with new mechanics and removed the original that people loved so dearly. They lost a sizable chunk of the player base that they never got back, but there was still enough to go on to be successful. Then they completely overhauled their item system to feature a new but more confusing and very limited card system that fundamentally changed the game a second time, and they hemorrhaged players again. I remember when they were originally released a brand new champion, with lore, some skins and other cool cosmetics, at a regular interval of every three weeks...but shortly after this system change, they had been promising a champion named Boris who was a Russian bear in a mech armed to the teeth...and he never came.
A couple months after not getting the next promised champion, the dev team made a post on the official forums. It was essentially a post asking the community what they could do to improve the game. Believe it or not, I had never seen so many pages upon pages of posts that were entirely constructive and not offensive or insulting, offering advice on what they think should be done to keep the game going, and most of them added up to adding an official ranked mode, bringing back the old map and letting players choose which one to play on, and bringing back the old item system. The community knew what they wanted and were actively willing to work with the dev team in a healthy manner to keep the game they wanted to much alive.
Around a week later, we got a post saying that the dev team was getting pulled from Paragon, that it would be officially shut down in April of that year, and no acknowledgement to the ideas offered to improve the game. I remember being dazed about the whole thing, and the community seemed just as confused, but lo and behold they meant it and the game was shutdown at the end of April. Doing some of my own research as well as watching some videos of others who did research, I found out that around the time of the original community post Fortnite had been released in July of the previous year but had really started to take off relatively recently, and instead of sticking around to fix their mistakes and have two very successful games, Epic canned Paragon at lightning speed to put everything behind their new money-maker. Originally I was just sad about it, but then I gave Fortnite a try and I became livid, for the reasons I stated earlier: to me, this was an incomplete game meant to appeal to and manipulate casual gamers to make massive amounts of money, and the anger only swelled when I learned about what happened with Bluehole and PUBG.