On Fri, Dec 9, 2016 at 9:50 AM, Simon Peyton Jones via ghc-devs <ghc-devs@haskell.org> wrote:
The big issue is (a) design and implementation effort, and (b) dealing with the privacy issues.

And (c) not everyone is going to upgrade their ghc, even if you backport the telemetry to older versions (potentially back to 7.6.3 or even earlier), so likely you'd only get telemetry from new users.

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