there has been some research a few years ago that proved the opposite, though.
Could you supply a link for that article? I would very much like to read it. Also, I would want it to be a recent article, to be believable for the current conversation we're having.
just a bunch of anecdotal evidence
Well, we all are just black boxing this, as we do not have access to these corporation's servers and what data they collect.
But you have to admit, that in my case at least, Occam's Razor would definitely point you in a certain direction.