Almost all companies charge 15% as commission, on the total table amount. They always get their money whether you win or loose. The winner will have to pay commission for his table money also, even when winning. On a broad calculation for say Rummy culture app, average 50000players a day* 10000average play amount per player means 7.50crore rupees is their commission alone per day. I am not counting the tournaments by them.
So if you loose or win the owners will get 7.5cr per day, 225cr per month, 27000cr per year%!
Nice isn't?
So keep Playing and make them rich! I haven't known anyone who made rich by playing rummy (except few testimonials!)