Shame on Google and Apple, it was always clear this was the end goal and next up is also your PC.
Right after will come the removal off apps they don't like and there is nothing you can do about it.
Stallman was right
In any case, I hope this blows up in Google's face hard, ROMs like LineageOS become as popular they were back in their heyday, and root hiders get extra attention too so banking apps etc work seamlessly as on non-rooted phones. Requiring some developer ID crap is essentially as bad as Apple has it, reason for which I've always considered developers having Apple phones quite unserious.
Commercial apps and services will require passkeys and device attestation, so you'll only be able to use open source software even if you have a device to run it.
The walls are closing in, and it's not just mobile. It's only a matter of time before passkeys are used to block Linux users from the commercial Internet as well.