TL;DR
- Efforts like Graphene OS face increasing pressure from apps that refuse to run on non-standard Android.
- The custom ROM project characterizes Google’s approach to device attestation as incomplete and flawed.
- Graphene OS is prepared to take legal action if Google won’t let it pass Play Integrity checks.
There’s a few apps that let you virtualize an older version of Android, but in my experience they’re slow, and they’re all from sketchy-looking Chinese companies that are for sure harvesting all your data. There’s also an open source project running for this, but I don’t remember what it was called and it was fairly limited.