Is there a reason for inconsistency in what a VPN breaks and doesn't break?

[HauntSanctuary (Privacy is Undead)]

On Apple Accounts, you are more likely logged in on the device itself so Apple will “forgive” you if you are using a VPN (also the Apple device itself is outside of the VPN unless it is a router level VPN).

The rest of your device isn’t unique enough that it flags you as a bot or worse yet an AI crawler.