I mean, if people want to give out helpful information about gland enlargement alongside links to where supplements can be purchased for the astonishingly low price of $12 a pill, who are we to try to stop them? Provide an unfiltered free speech platform and the stronger ideas will win, right?
Spam filters can be opt-in. Spam filters can be federated. Spam filters can be local. It simply isn't true that decentralized censorship resistant systems fundamentally require users to be inundated with spam.