> the best outcome is only marginally positive, doing nothing to deter future abuse.

This is the problem with virtually all spam remedies so far. If the penalty is that their success rate merely goes down, well it's already dismal, what's another few percent even matter? The economics are massively in their favor.

Until they start getting kicked off platforms for a certain number of spam complaints, the way creators get kicked off platforms for a certain number of DMCA strikes (which can be bogus, that's a problem I'd not like to copy), there's nothing incentivizing them to really, really hesitate and check with legal before pulling the trigger on an email.

Spammers should live in fear. Until we make that happen, nothing will change.