In Case You Didn't Know: Big Sur on M1 (and possibly on Intel) maintains a persistent, hardware-serial-number linked TLS connection to Apple (for APNS, just like on iOS) at all times when you are logged in, even if you don't use iCloud, App Store, iMessage, or FaceTime, and have all analytics turned off. There's no UI to disable this. This means that Apple has the coarse location track log (due to GeoIP of the client…
Unless of course you go on and install LittleSnitch or the Windows equivalent, which is something I’m not sure even the all of the HN does bother to do anymore.
And then you’re left off with trusting Microsoft or intel or AMD with their unaudited management engines running on-cpu with DMA access, oh and whatever is running in the EFI firmware...
It’s (did)trust all the way down