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I recall hearing a story about law enforcement identifying an otherwise-anonymous phone by other phones that pinged the same cell towers at the same times. Essentially, the person had two phones on them, so they were able to uniquely identify the individual based on the shared location history of the two devices.
So there’s that, too, assuming my memory isn’t just some CSI bullshit. (It seems reasonable that this attack vector is technologically possible, though, and it may not matter if it’s legal if the identification technique isn’t used as evidence in court.)
You could also try booting something from MicroSD so it’s easier to revert.
Seconding contacting Valve support, too.