Did they not know that piracy was a community before this post? It often hits front page, and is one of the very active communities. Even Reddit still has a piracy community ffs. At least take some time and/or get some feedback from the users before you take some off the cuff rash decisions.
Maybe they decided that they couldn’t maintain deniable plausibility of not knowing it existed with it being directly brought up in their support community
These are individuals volunteering their time to host a community and they don’t have deep pockets so they have to shield themselves from liability. I don’t blame them from deleting content from piracy, drug use, or porn communities because they could be held liable for the content. Even if it’s within their rights and they are not technically liable, any lawsuit will bring these small Lemmy communities down immediately