No, you can scope it to an App Group shared across all apps in one account (Team ID). Google uses this to aggressively fingerprint — if you’re signed in to Google Voice, your actions in Google Maps will still be associated to your account even if you’ve never signed in.
The fact that Keychain isn't in this list of APIs despite also being available to all apps by a developer (and optionally synced via iCloud) also points to them being OK with shared logins between apps (or they just forgot???)
Fingerprinting is more of an intent. Google will absolutely tell you it's just to ensure consistency among their products. Their most important product being targeted advertising. Using it to enable consistent targeted advertising would be what the advertising industry calls fingerprinting.
