I dunno. It sure makes sense to me to collect telemetry from free software installations, but I feel that having every platform or even piece of software to do it on its own with opt-out will inevitably lead to people being overwhelmed and angry.

I would, personally, prefer a single non-profit service that would list publicly what is being collected and publish the results as open data for anyone to use. Applications (at least on Linux) would not submit their reports directly, but would use a local relay service that could be turned off completely or that could filter what reports to send to the server and what to /dev/null.

Distributions and other software stores would then make it mandatory for software to use this relay and either patch out any other telemetry from their packages or straight out forbid those that would not comply.