Re: What information does Win 10 slurp?
During the process I was confronted with Cortana, which I attempted to remove or at least disable, only to find that in Win10 'Home' this is all but impossible.
I got a laptop which came with Win10 on it. I thought I'd take the opportunity to see what it was like before proceeding to wipe it (and enable to use it at least for some browsing while I work out which distro works best on it).
Cortana (and most of the bundled basic apps) seem to take a dim view to the fact that I have not supplied it with a Microsoft account. About 80-90% of the pre-installed stuff refuse to work without MS Account. Cortana occasionally whimpers but has so far suggested nothing.
So it appears that if you don't provide MS account and install applications the normal way (ie none of the MS cloudy stuff) it may hamper what they get. Don't use Edge either as I prefer Firefox and/or Palemoon.
Should probably have a look with wireshark to see how much it phones home, although I suspect the contents are likely to be encrypted.