Well, for starters, I don't consider the Tor browser to be anonymizing. It only offers protection against outside attackers, it offers almost no protection against the websites you may browse to (how could it?)

Pseudo-anonymization is snake oil because it's not that hard to reverse. All you have to do is combine the "anonymized" data with data from other sources and you can identify people. It doesn't even take that much data from other sources.

True anonymization is possible: it requires the collector to just keep general aggregate statistics and to immediately delete the individual telemetry reports. But few entities do that, and we have to just trust that the ones the claim they do are being honest and competent about it. But the track record is extremely poor so trusting in such claims is, in my opinion, very foolish.