I absolutely have not. But I don’t think the possibility of buying tracking ads is somehow excused because e.g “you couldn’t start internet businesses otherwise

I absolutely have not. But I don’t think the possibility of buying tracking ads is somehow excused because e.g “you couldn’t start internet businesses otherwise” or even “most of the free content online would disappear”. Targeting doesn’t have to imply tracking or trading in my info. Facebook knows my age and gender, and some of my interests (from groups etc). That should be plenty. That means a company that sells kitchens can’t target people “interested in kitchens” in the sense they have recently searches for it or visited a site of a kitchen manufacturer that told Facebook. They can target people in country X of a certain age. If that doesn’t sell enough kitchens then just close down me kitchen business or buy a bus stop ad but don’t follow me around the internet.