One thing that I don't understand though, so you found them doing things that against your ToS and cheat your system, abuse your bonus, etc. but later let them withdraw the money they got from it?
I'm also curious about this matter. OP wasn't eligible for the bonus as it was created for old users. Still 'moegreen' has received the bonus by creating a new account. The user has also fulfilled the wagering requirement from the free spins winning, then made a deposit to enable his withdrawal. Perhaps, 8Bet team doesn't have any strong evidence of those account connections. It could be a reason for paying the user.