Mastodon is a great tool, and surely makes it easier, and empowers you to block and filter out Nazis, report and pressure admnis to do PUNT THE NAZIS and also to vote with your feet to instances where admins do the right thing... which is BEATING THE FUCK OUT OF NAZIS rather than making money from them, like on that other site.
End of the day, it's still going to come down to people doing the right thing.