Exactly what you imply with your nostalgia for PIMs: increased fragmentation. There is value in witholding information/data/usage from Google (or FB, or Amazon, or Palantir, etc.) -- particularly personal data that is most valuable in aggregate -- value that reflects a decreased ability to cause problems, worries, and/or concerns in users' lives.
Exactly what you imply with your nostalgia for PIMs: increased fragmentation. There is value in witholding information/data/usage from Google (or FB, or Amazon, or Palantir, etc.) -- particularly personal data that is most valuable in aggregate -- value that reflects a decreased ability to cause problems, worries, and/or concerns in users' lives.