It can also be used as an alibi, so if you go kill your ex wife, make sure you have location tracking turned on, and give your phone to someone else to be in another place.
What's the difference? One is somewhat difficult to fake, the other is laughably easy.
Not saying it hasn't been attempted somewhere, I'm saying it would be a very weak prosecutor who couldn't cast doubt on it as a piece of "proof"
A defendant using it to create reasonable doubt is a win for the defense. A prosecutor who is only able to cast doubt on it is not a win for the prosecution.