This list is biased around mastodon, but works for any federated instance. You have to remember that “Federated is federated” and KBIN connects not just to Lemmy but ALL the fediverse. It’s important you go to admin settings and add abusive sites to the block list - for your sanity and the safety of your users
Or you could just go to an instance that has the content you want blocked instead of trying to force it on a new community