Piggybacking on this... I create my fair share of "burner accounts" and almost always they (not just Google) connect it to my true identity. Granted I'm not using VPNs or really trying to hide the connection but it seems trivial for them to associate.

My experience has been that all the consumer privacy/security tools are varying degrees of “good” at keeping away bad actors, trackers, advertisers, and most third parties, but when it comes to the big dogs, there’s nothing you can really do to stop them. Google, Facebook, etc. just have too many data points already available to them so they can easily build a picture of you. There are simply too many services that have them running around in the background or just straight up depend on them.

All you can do is leave their ecosystem as much as you can and accept you will never be fully rid of them