Power to the people.
As to "many cases where online communities document or facilitate crimes elsewhere", why criminalise the speech if the action is already criminalised?
That leaves only "Campaigns to harass individuals and groups". Why wouldn't moderation tools as powerful as the ones employed by Twitter's own moderators deal with that?
[1] https://mtsu.edu/first-amendment/article/970/incitement-to-i...
That is, it's not clear in the US you can ban something on the basis of it being immoral, you need to have the justification that it is "documentation of a crime".
Anime image boards are not in a hurry to expunge "lolicon" images because they don't face any consequence from having them.
I wouldn't blame Tumbler from banning ero images a few years back because ero image of real people are a lot of trouble. You have child porn, revenge porn, etc. Pornography produced by professionals has documentation about provenance (every performer showed somebody their driver's license, birth certificate, probably got issued a 1099) if this was applied to people posting images from the wild they would say people's privacy is being violated.