I kindly urge you to reconsider this decision, as there are several communities on that instance I subscribe to and enjoy. There are plenty of SFW communities there related to touhou, music, and other topics for example.
As for 1, the instance does not seem to focus very heavily on piracy, though it does allow it. There are several piracy related instances that are arguably a larger concern with regards to this. And as for 2, although the instance does allow lolicon hentai, this material is not illegal in the US, and is protected free speech as long as it passes the same "Miller test" that any porn must. The instance does not allow or contain actual CSAM. Lolicon material, although offensive to some, is not CSAM, neither morally nor under the law.
Personally I don't care about the loli stuff. I'm not interested in it, really I'm not even interested in hentai in general and block most of the communities for it. But it harms nobody and I don't really care what people decide to look at. I just want the other communities there.
Yes it is