sexual harassment
We have this nostalgia for web forums on here, but my first 5 years online were spent like this:
2 years on a forum being constantly harassed by a guy who would "joke" about raping me, while the mods repeatedly banned him for miscellaneous trolling, only for him to come back in a few days with a new account
Then 3 years on a private forum that slowly became more and more right-wing, with the mods perfectly content with the situation because they were the ones driving it
sexual harassment
Mastodon instances are still vulnerable to trolls account hopping, but users are at least empowered to block and mute...instead of having to wait around for a problem user to get banned.