explain this then
http://imgur.com/gallery/n3WMt
videos have already been taken down
I didn't say you can't
file for trademarks, only that there's nothing you can do about someone saying "snails react"
youtube taking videos down is not representative of the law. to my knowledge, all you have to do is report a video enough times and they'll take it down, regardless of what's actually in the video. so unless the video was taken down as a result of legitimate legal action, it doesn't really matter. all that shows is that youtube is a pushover
more: trademarks exist to protect companies. even if it is something simple like "snails react" it's possible for them to win a lawsuit over it, but that's only going to happen if it's abundantly clear that you're trying to copy them or pretend to be them. if your videos have existed longer than the trademark then they would certainly not be able to win that suit (but the suit may still happen because you can sue for anything; all that matters is who wins)