I can see how chargebacks could be more than your entire earnings, since most of the money deposited goes to other players, not the house.
For example, let’s say a player deposits $1000. He loses his $1000 while playing only enough raked hands to generate $200 in rake fees. Your commission is 20% of the rake, or $40.
If he charges back the $1000 purchase, what’s the poker room supposed to do? Has anyone looked at the T&C to find out how they address this?