"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.
it didn't start at gps data from google... it went from public posts on facebook to the email and phone number account associated with that to the google account associated with that to the gps data associated with the google account. if you show me them using a reach around route to get that gps data and persecute peaceful protestors that haven't been suspected of criminal activity then i do agree it's troubling. if you want me to agree that the government is not within their rights seek evidence via normal, judge approved, subpoenas to investigate/prosecute people storming the capital and doing legitimate crimes then i disagree. you need probable cause and that bar should be fairly high.