(Technically the third party doctrine would still apply in any case, because this would be a statutory protection rather than a constitutional protection.)

EG, technically cops don't need a warrant or subpoena to ask Google where you were on a particular day. Though, in practice, they often still get one because they know that it's kinda unfair and judicial or statutory protections are probably coming soon and they don't want to jeopardize the prosecution should the law change during the investigation.

For example, the January 6 insurrectionists are largely being caught through location data obtained under warrant from Google. Do they technically need the warrant? No. And if they were investigating, like, shoplifters, they probably wouldn't have bothered to get one. But they don't want to let thousands of insurrectionists off the hook in case this is the case where the courts decide to flip.