I already don't use Twitter, and encourage my friends not to, either. But I did that years ago. There's not really a whole lot else I can do? Start a Fight Club, squat in an old condemned house, and blow up their building at the end? I have bills to pay and family that depends on those bills being paid.
What should they do? Outlaw free speech & things that other people don't like? Guess I'll be going to jail since I'm an atheist & will gladly call most Christians mentally ill. Since Trump is in power prob will be one of the first things he outlaws. You should research legal cases regarding free speech. Many Jews have even represented & defended Nazis rights to march & speak their opinions in public without violence or censorship. There are many good arguments & thought that has went into that case law. Just cause it bothers you doesn't mean that it hasn't been considered before.
and I get that we were all taught to ask questions for the titles on our high school essays, but asking why pro-hitler content is promoted by a company whose CEO literally publicly performed a Nazi salute is less effective than the headline:
"There is a pro-hitler and Holocaust-denying ad on Twitter."