No one's talking about "anonymous usage data". The topic at question is primary data available to first party apps (even if they remain on device), often synced to iCloud and available to say, Siri. I'm sure I accepted a bunch of EULAs when turning on iCloud and Siri, but Facebook will argue they've shown you their EULA too. That's not "request permissions the same way third party apps do", and some of the data can't even be requested through normal permission prompts, which is why Meta is forcing Apple's hand with the EU stuff.