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.
All web accessible apps are available. PWA means Progressive web applications so applications on the web lit. It's like saving a webpage when you choose add to home screen, It's so easy to delete it as well, not sure if it's refundable though.
I think it would be impossible to accidentally buy something since there should be confirmation on installing apps even if it's for free and specially if it has a fee.