I think it is a good idea to publish the lemmy web app to the play store. I think it is possible, for example there is a lite version of Google Maps on the play store which is just a web app.
Reference https://developers.google.com/codelabs/pwa-in-play#0
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There’s already several native android apps, I just did a release for jerboa.
I’d much rather people use and contribute to native apps rather than have 20 PWA’s each taking up the ram space of an entire browser running on their phones.
Also, Google is restrictive and won’t let devs show donation links.