I would block gore communities on a personal level, but there's no need to do so on a server level unless they're doing something worth defederating for, like any of the following:
- posting cp
- using their server to DoS/DDoS others
- dox-ing people
- allowing their users to harass others AND refusing to punish such behavior
- same as above except for ban evasion
I'd like to have a force-nsfw option for communities that don't enforce proper usage of the NSFW tag, but for now I'd have to block them most likely.