If you are using an app, and you supposedly earn or win $ on it, but then it wants you to personally pay for the release of those earnings/winnings, etc. I’d be very wary, as this is a common tactic on many scamming apps.
They could be using the tactic simply to phish for your credit or debit information.
A reputable app/site will usually just take any transaction fees out of the earnings or winnings, rather than asking you to pay out of your own pocket, at least in my experience.