Fuss over nothing?
For once MS are doing the right thing: they are releasing a preview to learn what bits people like and use, and to work out how to make something less awful than Windows 8.
They clearly say they will track how you use it. You have to agree to that to install it. So to be upset that they are doing what they said they will do seems a little silly.
So far, I think it seems like a step forward from Windows 8.1 and not much worse than Windows 7.
However, there isn't much I can use the Win 10 machine for because most of what I do on a computer depends on software I've not installed, or involved confidential information I don't want to share,