alt Hacker NewsThe case you linked isn't about the government filming people in public, though. Carpenter vs. US was a case about the government demanding private information about users' locations from cell service providers. By comparison, the 9th circuit concluded that the plain view doctrine means electronic license plate readers are legal :https://cdn.ca9.uscourts.gov/datastore/opinions/2020/05/04/1...
An officer doesn't need a warrant to sit at a cross section and write down license plate numbers. A device doing the same thing is also legal.
Of course that's a fair interpretation, I am saying there's some tension between mass surveillance and the fourth just because its "done in public" doesn't mean it automatically escapes scrutiny now or going forward.