How many are necessary, or even desirable, and not a net drain on human happiness by optimizing for endless engagement? I don't like the direction in which the

How many are necessary, or even desirable, and not a net drain on human happiness by optimizing for endless engagement? I don't like the direction in which the ad-supported model is pushing content. Internet pre-advertising had plenty of useful and interesting sites. And Wikipedia is ad-free as well. And without the competition of zero-cost ad-supported commercial sites, other business models would rise to take their place.