I suspect anti-abuse at scale is impossible. The mistake (albeit a hugely profitable one) was to turn themselves into a marketplace and platform rather than a curated seller. The implication is clear: any marketplace is untrustworthy and caveat emptor.
"At scale" is a euphemism for an ideology whose goal is world domination, there's no reason for a desire for it to be protected. Anti-abuse systems being in place is more important than preventing constraints on growth.
I mean seriously, in the past several years we've learned that "at scale" is actually a public hazard.