Well like I said you can’t (as far as I can tell) log in without identifying yourself with your email address.
If you fart loudly, they can tell what ingredient in your lunch caused it (or maybe the root cause was that six pack from last night). That’s the “Siri” (or whatever the MS equivalent is called) part, which listens if you enable it.
There’s a wizard where you can disable what’s collected - there’s like 10 switches. I disabled most, but I left some (to auto-submit bugs, etc.). It’s not worse than Google - most of what Google has (like recording your searches, “accelerating” your browsing and similar crap), Windows 10 has too.