OP: take a minute to read over Shuffle’s T&Cs. Or any sites for that matter. They specifically state that they can ban a player at anytime for any reason. Shuffle is very specific about that with their affiliate program. Same is true for their airdrops.
I know the player you’re referring to and she was an incredibly toxic player. I’m assuming Shuffle didn’t want to be associated with that. In fact, that player has been notoriously banned from many well known casinos or muted at the very least.