I don't know what due-diligence that YC do but I can imagine, as someone who only knows the basics of crypto-currency, of being sucked into some confident founder telling me that, "of course it is safe, it uses stable coins".
The risks seem really obvious after everything falls through but there are plenty of other companies that are "obvious scams" who happen to have made it by luck/skill/investment.
> The risks seem really obvious after everything falls through
The risks are obvious the second you see that they offer 15% yield, which is roughly DOUBLE the current yield of the average junk bond, and about QUADRUPLE the yield at the time YC closed.
The risks seem really obvious after everything falls through but there are plenty of other companies that are "obvious scams" who happen to have made it by luck/skill/investment.