I just don’t see the point. Android is open source and there already exist alternatives to the things google play services dose. Instead of the googles push nonfiction system(FCM) there is unifiedpush https://unifiedpush.org/ and alternative apps stores like f-droid or accrescent https://accrescent.app/.

I hope you a right about the security improving but i am not so optimistic of it even coming close to Android.

Linux phones are way less secure than Android phones. There already exist phone os like grapheneos or lineageos or calyxos that degoogle. Linux desktop and phone don’t sandbox apps so if you install one malicious app it has access to all files on the phone your camera and so on. Even if you use flatpak the flatpak sandbox is weaker(easier to break out of) and the app dev of the flatpak app decide what permission it should have unlike on android where the user does so with major permissions like camera.

I have watched the futo video and i think don’t think its very likely it will become a paid feature. The CTO said they would want to have the registration require some kind of cost but it was almost certainly meant as a computing cost not money. Link to the same video in case you can’t play it https://i.imgur.com/QMDjn7T.mp4