Unfortunately it happens all too frequently.
My personal record for non payment by a casino is $36,000. I watched my stats all month and each day the number of players I had increased at a normal pace, commissions rose progressively too. The month ended and my commission due was a little over $36,000. And stats continued to reflect that until the 10th of the month when they ran commission payments. It then magically changed to a NEGATIVE balance of $100!!!!! The casino didnt even bother to contact me!!!! I finally reached them via email and the manager blew it off as a glitch in their system and that my “real” balance was -$100. I went wild, but there wasnt a damned thing I could do about it. I pulled their banners and moved on.
For NON casinos my record non payments were $17K for Alladvantage, $14K for Next Card and when Match.com purchased OneandOnly network I went from earning $15,000 a month with them to $400 as they no longer honored the previous client for life policy that OneandOnly had.
In this business we get put thru the ringer quite often.