There's no way for any centralized company will reveal their customer's identity if the one who ask it has zero reputation. Considering if Yolo89 was telling his username account in Stake, no proof if Yolo89 is actually own that's account. Someone can just create alt account and claiming if he own x account in Stake. Also this case doesn't have any financial lose or gain for Stake, they wouldn't give any shit about it.

I don't think so, the fact is his account doesn't have any reputation and he can easily earn $220. Nothing to lose and he can create another new account.