"May"? This is exactly how the January 6th protestors were identified.
The data came from Google and included GPS data.
Either way, I don't think that matters. My point is that tech companies store data that can be used to identify everyone present at a specific location and timeframe, and that data is easily available to the government. There's no "may" about it.
> investigators obtained GPS and other cell phone records from Google via a search warrant
Search warrants are and remain the correct tool for the government to get this data. What this article is worrying about is the fact that sometimes the government simply purchases this data without any sign off from a judge. That's where constitutional protections are eroded.
Your outrage is misplaced until such time when the government can buy this data from Google without a search warrant.