- Privacy seems to be top-notch

It's baffling at best that you imply you believe this.

It's proprietary software (so you can't prove it already at this point) from one of the most user-hostile companies in history, and one that at the bare minimum "was" involved in mass data gathering programs (example: PRISM), but everything points to "still is" and "will be" - not only for arbitrary governments but for its own pockets too.