That browser requires an account. Most people use it with a google account, because they are using gmail and other google services. So their adtech doesn't need

That browser requires an account. Most people use it with a google account, because they are using gmail and other google services. So their adtech doesn't need to be that smart. Why bother trying to track a Firefox user who uses a VPN and an adblock when most of your users don't even bother to hide from you?