IANAL, what are the practical implications of this? I assume the outcome is police would first need probable cause to suspect a specific person of a crime, and then get a warrant for that person's location. Am I wrong?
Rather you should have evidence that a specific person did a specific thing and need to conduct a search to find additional evidence of said person doing said thing.
The 4th amendment protects US persons from the government just doing generalized searches in hopes that it will turn up useful info. You have a right to privacy from the government unless the government can clear a high bar showing probable cause that you’ve done something wrong.
However, other apps might record location history in the cloud, so there might be an impact there?