If you want to join Stadia but don't have a bank account or credit card, CashApp will let you CREATE a usable cash card. And it's usable right away, you don't have to wait for it to come in the mail.
So, if you have a google family member who doesn't have their own Stadia account yet (i.e. long-distance partners, etc.) Or a special needs adult who has to go through a million miles of red tape to see their own disability money? This is an awesome workaround.