Ok but real talk beloved childrens properties having a darker adult take is literally nothing new, been going on since the 80s if not further back.
Transformers, Samurai Jack, Deadpool, Wolverine, TMNT, etc...
Also, a Scooby Doo spinoff that's for adults wasn't even out of nowhere. Even if we discount the movies, Mystery Incorporated was much different and also had a far darker (but just not far enough for kids) tone. Velma is just growing up with their audience. The Winnie the Pooh movie? Clearly going to be a horror comedy, it's public domain Winnie the Pooh