If you've got an automated vetting process with a 99.999% success rate, but are dealing with billions of accounts, that's still tens of thousands of false positives. At that level, "percentage" is an insufficient measure. You want "permillionage", or maybe more colloquially "DPM" for "Defects Per Million" or even "DPB". You'll still get false positives though, so you provide an appeal process. But what's to prevent t…
Yes; decentralization
end users don't want to run their own spam and moderation filters, and they definitely do want them.