Yeah but this isn’t as big a deal as the clickbait headline.

Use Pi-hole and block their domains

Maybe. First you should check out https://en.m.wikipedia.org/wiki/Section_230 which explains websites generally aren’t responsible for users posting their own content. However, that’s not a clear protection from anything. If you end up with blatantly illegal material, you will be investigated and forced to turn over data, surrender equipment, etc. They would have to prove that you were aware and complicit, but it’s generally not worth the trouble unless you’re making money from it. That being said if you got a lawyer that is familiar with section 230 to look over a disclaimer and your intentions, you’re probably fairly protected. Also, the smaller you are, generally you’re much less likely of being targeted should something happen.

Disclaimer; I’m not a source of defensive legal advice.