>Yes regular cookie from Google's perspective, but super in that it works across sites. If for some reason you don't just take Google's word you might suspect they collude and share / sell your identity to the site as well...
That's just third party cookies.
>Why wouldn't I be able to reset and re-enroll in the app and then have it generate me a fresh new cookie attestation history?
You can get a new uuid, but then that'll be associated with a key that has a high attestation count, which is also suspicious. It's like detecting spam from an account that has 1000 posts in 1 hr vs an ip that created 1000 accounts in one hr making one post each. Both are suspicious.
I still don't get how those 1000 posts tallied with previous UUID would get correlated with the new UUID. If it's only source IP address or similar finger prints, those are relatively easy to get rid off, hide, renew.
(At least, when your goal is to do as many fake attestations as possible rather than use your device for something more useful)