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OK, there's some value in diversifying instead of using one provider for everything but mostly he just swapped Apple, Fastmail, or Clicky in place of Google. They can still track him, read his email, know his calendar... The benefit here is marginal. And how do those companies stack up against Google when it comes to security? It's one thing to protect the data against snooping by the provider, it's anoter to protect it from everyone else. Google is pretty solid, often on the cutting edge (PFS, certificate pinning). |
An example: where you walk in public is public information, but for most of human history, no one has had the capability to keep a database of that information and query it retroactively. Your location information is therefore less private now than it was before, because that information used to be impossible to reference meaningfully.
The same concept goes for email, calendars, contact graphs, etc. Using providers that don't have, or consciously avoid the capability to aggregate, analyze, and query it improves your privacy. Google is not one of those providers.