Obvious to a human manually looking at the account isn't obvious to a computer system that has to pick them out a huge dataset. You will never be able to ban Fiverr type accounts because for the same reason residential VPNs work well. You're paying someone who has a clean record and will send all the right signals.
HN works because it's niche. It can be moderated by a handful of people. Once you cross the "can't be moderated by humans" threshold of size you're solving a completely different problem.
I won't knock you for saying "well then you shouldn't exist at that scale" but that's a non-answer for the real world where giving up PII in exchange for participating in a huge social network is a trade enough people are willing to make that you feel pressure to do it in order to get in.
It doesn't follow to me, those people open thousands of account for those scams, how are they clean? They are not sophisticated, they don't even use them like real humans and it's literally for $5!
> "can't be moderated by humans" threshold
Is it a threshold or simply a cost center that starts to be big and needs to be slashed in order to please shareholders?
To me it's perfectly possible to be big and have moderators, you just can't have it cheaply.
HN works because it's niche. It can be moderated by a handful of people. Once you cross the "can't be moderated by humans" threshold of size you're solving a completely different problem.
I won't knock you for saying "well then you shouldn't exist at that scale" but that's a non-answer for the real world where giving up PII in exchange for participating in a huge social network is a trade enough people are willing to make that you feel pressure to do it in order to get in.