It'll probably end up "solved" in a similar way to email span being "solved" - if global spam starts to become a problem, you'll have big blocklists of spammy i

It'll probably end up "solved" in a similar way to email span being "solved" - if global spam starts to become a problem, you'll have big blocklists of spammy instances and general suspicion towards federating with any new instance that doesn't look sufficiently trustworthy.