I'm curious about what apps would be available since PWA is something new in the app industry and also, how will developers sell their apps? If it's lightning fast I might accidentally buy something I don't want.
I think you have to be very careful if you don't want to buy something that you don't want. And besides, there is always a confirmation for all purchases that we buy. Sometimes, there are many confirmations just to be sure that you are really interested to buy the product. If you haven't entered anything using your credentials, I don't think, they will push with the transaction.