Linux users are more likely not to opt-in and actively opt-out of spyware, telemetry, or whatever you want to call it.

The ones that don't are more likely those who leave things on defaults, are involved with the project or a distro, or similar. No, I don't have anything that backs this up. The statistics they're using can never be accurate, by virtue of being free software that ships on privacy concious distros to privacy cincious people. There was a study that backs up this claim, but I'm not google.

OTOH, xfce is doing fine.