That still sounds like we have a problem with Google/Facebook and not with Microsoft turning it on by default. The default behaviour for Google/Facebook should

That still sounds like we have a problem with Google/Facebook and not with Microsoft turning it on by default. The default behaviour for Google/Facebook should be not to track people that aren't logged in to their services. That should go double for people who are not just neutral but explicitly telling them "really, don't track me" in a header. There is no justification of "we're just improving services" for people who are telling you "I don't want to use your service and I don't want to help you improve your services."