I have some advice for Demi coming from a kind place.
It's time to address this stuff, it's probably driving you mad every day thinking people are going to find it out. It can't be healthy to have the anxiety about all of this stuff.
Own it, say "yeah I did make those hate threads and I did do a number on that MUA but I've changed and I am sorry"
It will feel so much better owning up to this and moving on. Probably get a load of views and revenue from it too.
I think everyone would honestly have more respect for you if you were truly sorry about the MUA and the dobbing your poor little brother in for something he totally didn't do.
Just a suggestion because we know you're reading this