Not sure how forcing a legal name is involved with online games, but the others can be solved by simply ignoring the troll.
> Twilio numbers used to call and harass people.
And if this creeps into legal harassment, I'm sure the person receiving the calls can work with Twilio and law enforcement.
> If someone feels like they can deliver abuse anonymously then they're certainly more likely to do so.
This is a conclusion provided without evidence. I can easily send someone a bunch of anonymous hate mail using a number of services, but I don't.
> What I bet you haven't seen is a verified Twitter account used to torture poor souls.
I beg your pardon. Ted Cruz has a verified Twitter account, and I find every word he says to be torture.