i am good with the subscription and pay once approaches they mentioned.
the iffy portion is the in-app payment sdk. i hope f-droid will be the one providing those to have it standardized.
in-app ads are kinda okay. i won’t use said app, but if f-droid labels apps like those as how it labels apps with non-foss/features-you-may-not-like, it should be okay.
i remember seeing this in a lemmy post somewhere.