I've thought about this a lot as a Bluesky victim and I believe most of the "big" block lists would just constantly be cultivated by grifters and then "go rogue" (finish the grift)

Better to use a tag-based web-of-trust system where you label things aboutnpubs and their posts. Then people who trust your labels can use them to filter people out of a feed, and it should also become obvious a lot more quickly when a highly trusted npub "goes rogue"