Edit: googled and found this: https://store.app/
PWAs really struggle with distribution - it comes down to the PWA maker (or team) having enough charisma, alignment, and budget to get people to follow the kind of arcane instructions for installing each unique PWA.
On Androids, I think you can install third party appstores. fdroid is the one I've heard before, but there could be more.
Very sad state of affair considering we are progressing into the 2nd quarter of the 21st Century, and some people are not complaining but willingly embracing (paying) into this by design incapability in the name of security and convenience (read profit margins).
It's methaphorically like willingly living in a country with virtual great wall around with a benevelont dictator but it's one of the life choices that people voluntarily need to make nonetheless.
As mentioned this is possible but not recommended for Android. I'm not sure if anyone is releasing paid apps outside of Play store though.