This is an optional feature, you actually have to go out of your way to set this feature up, for the people that do NOT want to use this feature then just create a local login like you always did and go along your merry way.
No one is forcing you to use the feature, and even if you use the Family feature you can even turn those monitoring things off, it is right there in the setup.
Microsoft have repeatedly said it does not use kids data and target kids, they actually go out of their way to protect kids using their products, read up on it. In any case most of these fear mongering parents probably use iPhones and iPads to babysit there kids.
Hey people I heard there is a sale on Tinfoil hats on sale.