Remember, for spammers to keep up an attack it costs them exponentially more in a p2p model. Cause they have to trick themselves once, you twice, and your buddy 4 times, etc.
Discussion
True, but credentials are unlimited on nostr so that is certainly an advantage over the centralized model.
Not to toot my own horn but I just spotted a guy like that tonight. I think you can check my profile history if you don't believe me. It is easier to spot those folks than it seems. I have a protocol I follow.