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Opt-in Telemetry and Asking Users for Feedback May Not Work in Practice
(theevilskeleton.gitlab.io)
The GNOME Project is a free and open source desktop and computing platform for open platforms like Linux that strives to be an easy and elegant way to use your computer. GNOME software is developed openly and ethically by both individual contributors and corporate partners, and is distributed under the GNU General Public License.
The only way to ensure correct statistics is to never give the user a choice in the matter, but opt-in vs opt-out have nothing to do with that debate, opt-in is user centric, opt-out is not.