If a video game in-game currency is "input only", as in, the value goes from the players to the company and stays there, it's effectively just a payment for a s

If a video game in-game currency is "input only", as in, the value goes from the players to the company and stays there, it's effectively just a payment for a service. If you allow transfers between users and cashing out to real money (as Epik's "Masterbucks"), then you'd have to comply with these kinds of regulations, so video games try and take steps to ensure that their currencies aren't treated like that, or at least if this does happen, they can't be seen as facilitating it. Epik's marketing material explicitly mentions both "fully transferrable" and "convertible to dollars" - this combination means that you're intentionally running a service that can be used for money transfers, and thus you need to ensure KYC (know your customer) and AML (anti money-laundering) compliance or shut down that service.