I'm not saying anyone was wrong to limit mastodon.social, but for comparison: since Twitter was bought, I have been periodically checking the main feed Twitter

I'm not saying anyone was wrong to limit mastodon.social, but for comparison: since Twitter was bought, I have been periodically checking the main feed Twitter shows an non-logged-in visitor, maybe a couple times a week. The "large amount of cryptocurrency spam" my instance saw from mastodon.social was maybe ~15% of what that couple-times-a-week visit showed on Twitter (to say nothing about my old account's poor DMs). Sure, anecdotal as heck, but I'd unscientifically class Mastodon's current spam problem as approximately equivalent to the level of spam one gets as an Instagram user being tagged into posts for sunglasses or diet pills etc.