But yeah, I’d say the casino doesn’t really earn direct profit in terms of cash from these sponsored tournaments. For example, in my case, I once deposited wagered a bit then just withdrew the remaining profit/balance.
Most people who participate in poker tournaments are probably interested in withdrawing their winnings immediately, i.e., without any additional requirements. However, if a deposit is required to participate, there is a possibility that a user won't only play in a poker tournament but also become interested in games on the gambling platform.