I mean, AI generates spam at the behest of unreasonable people currently, and we can just think of it as a powerful automated extension of other technologies. We could say it's a new problem in quantity but the same old problem in kind.
Now, with that said I don't think we're very far from automated agents causing problems all on their own.
AI also generates spam though, so this is a much bigger problem than merely "unreasonable" people alone.