Earlier quoted context omitted.
The "3rd party doctrine" is a bullshit interpretation and it needs to die. When I go through the trouble of coming up with a long complicated password and setup two factor authentication it's pretty obvious that I have "an expectation of privacy". Maybe what the tech companies need to do is have a checkmark on sign up that says "I expect my data to be private".
My take: The third party doctrine is a natural consequence of the use of "their" in the 4th amendment. People have a fourth amendment right to "their" persons, houses, papers, and effects. Bits on Google's hard drives aren't "theirs" they're Google's. You have no property right in those bits. If Google loses them, you can't sue them for negligence. If they change their TOS and monetize those bits, you have no recours…
Of course, a lot information is actually generated by Google and even though it's about you (search history, etc) and doesn't belong to you.