It’s more like: police asking a witness, and them voluntarily talking. Because that’s literally what it is.
A warrant protects your belongings from search and seizure. The unfortunate truth is that when you give data away… you give it away. The internet gives people a false sense of privacy because they can use it from inside of their house. But, telling Google where you parked your car during a bank robbery is no different than telling a newspaper reporter where you parked your car during a bank robbery.
The cloud is, and always has been, someone else’s computer.