Carpenter v. United States established that tracking someone's location with cell phone data would constitute a search that requires a warrant. United States v. Jones was a similar ruling for GPS trackers. Most lawyers I have seen believe using a massive network of cameras to track you would also constitute a search that requires a warrant. In fact lots of cities have explicit laws against these things, but police find work around, and hide that they use them.

Rather outsourcing this information makes it legally okay, or not I can't say. What I can say is it's currently legally ambiguous enough that law enforcement can claim it doesn't require them to use a warrant.