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.
> Laws don't enforce themselves.
What has that got to do with Twitter? Please try to stay on track.