So of course... they emailed me offering access to a VIP bonus program! To get in I just needed to keep betting as much as possible. Such nice people.
In 2016 I joined an online casino (as a PM) and was confronted by the biggest machine learning and real-time data operation I had ever seen at the time.
All about pushing wagering bonuses, measured by deposits.
At the time we still called this class of user "high value". Not allowed to do that anymore... Gives the game away!
There is a market for established non-winning accounts you can sell to sharps.