The funny thing about SEGA doing this, is that they absolutely don't have to.
Nintendo taking down videos without warning is bad because a lot of the videos they take down are fan works or gameplay videos. This isn't OK because those videos are iterative works. They derive from Nintendo's content, but because they are iterative, some of the content belongs to the YouTuber. With an LP, for example, you are showing off YOUR experience with the game, which is different to someone else's content, and showing off just the game itself is not necessarily the main purpose.
However, the Sonic Boom episodes are just flat out TV episodes. People uploading them really are stealing content and money from SEGA by uploading them to YouTube, as the work isn't iterative (commentaries don't count for TV Shows because the TV episode plays out the exact same way no matter who is commentating on it). So SEGA would honestly be perfectly entitled to just claim the videos without warning.
But they aren't doing that and are actually giving people warning. Meanwhile, Nintendo are still basically the YouTube Gaming Yakuza.