Note that Chrome Apps != Progressive Web Apps, which you can still install on desktop Chrome and the new Edge and hopefully will gain more traction.
https://chrome.google.com/webstore/detail/web-server-for-chr...
A lot of use-cases like e.g. chat apps, depend on that kind of technology.
Spotify is NOT ok with that (I think they disabled IAP). However, Google does allow for that.
Protip: Tapping `<button/>` elements is 23% cheaper than tapping `UIButton`s, which is something I realised looking at my YT bill one day.