You can’t verify how private MacOS and Windows are, besides checking the network to see if they send data to a server, as unlike Linux they are closed source.
The PC Security Channel made a video comparing Windows 11 and XP with Wireshark. The telemetry settings in Windows 11 are set to minimal, you can see his response to a specific comment about it. Here’s the link: https://youtu.be/IT4vDfA_4NI
He doesn’t say he has minimal telemetry, he actually says it’s a brand new laptop (from manufacturer) out of the box with nothing installed. What we are referring to above is with telemetry disabled in oobe.
Here is an alternative Piped link(s): https://piped.video/IT4vDfA_4NI
Piped is a privacy-respecting open-source alternative frontend to YouTube.
I’m open-source, check me out at GitHub.