Tracking will be more profitable. But there is a dark difference if it is de facto the main source of revenue, or some scammy addition. In the later case, it

Tracking will be more profitable. But there is a dark difference if it is de facto the main source of revenue, or some scammy addition. In the later case, it can be regulated - the same way as we have safety regulation for food or equipment. In some sense, the analogy is not that far off - the current web is made to be addictive. A lot distractions have well known, negative impact on mental health.