The guy is clearly a scammer, and he's dragging this out as long as possible. This tactic is as old as scamming itself.
People with euros in his account have a chance at a recovery because he does not control that account any more.
People with btc in his wallet (myself included) can kiss that money goodbye, because nothing stops him from giving it back, yet he chooses not to.
The guy is a fucking scammer, he got 20,000 btc, he's rich. He just has to return the euros and he's a made man. Nobody can force him to return the btc.
This isn't exactly a completely anonymous guy who just scammed someone on a forum. We need to find information about him IRL.
We know his name.
Can we find the name of his bank?
Can we find an address of his business?