I'm related to a famous drama youtuber and have a lot of dirt on them
Is it anything shocking? Are you going to reveal it?
He is a fraud and a dumbass he deserves to be pulled down.
You should not do anything to harm a family member. Doing so you could ruin their life and estrange you from your entire family.
He is a faker who doesn't deserve his fame, plus it will be funny watching them have a meltdown.
Instead of trying to harm them, can't you just ignore them? I find that I'm happiest when I ignore the things I don't like rather than engaging with them. Instead of watching your relative on youtube, try reading a book or listening to music.