I need a clarification here... so some guy has some balance at Stake. And that balance mysteriously disappears one morning!!! After that, that guy complains and asks for a refund?! Well, this is something new from scammers!

You seem to have misunderstood the issue here. The gambler's balance didn't just magically disappear. Stake froze his account and siezed his funds due to which he created a scam accusation thread against them.
The Stake team is currently investigating the issue. We are talking about 200 grand here which is why this will probably take time to get completely resolved.