I know nothing about the sector and might have butchered some details but I see an interview one time with some professional online gamblers. They all had many millions in many play accounts but took only a tiny amount from each every month much less than the maximum withdraw. Barely enough to live on.

They explained that some games were rigged but still had to give [big] prizes to someone to keep the show going. Some would organize events and send their big players on trips.

Like an open secret no one talked about. The system is this: For a good while keep depositing more money into the account than spend and leave all the winnings. If they are cheating such account will win incremental amounts. Cheating or not they need to show their players are real people periodically so they organize VIP events and send the top players.

When asked if their winnings were real they examine the poker faces around them for a while until one said that it was irrelevant. I wont cash out either way!

If you could find that, I would be really interested to watch it.