Nielsen ratings[0] have been a thing since the 1930s, so in a way people's attention has indeed been commoditized for a while now - only with an increasing granularity that has now reached some of an individual's metrics (and we're continuing to go along that path with smart devices and addition of sensors).
I'm not sure why saying to people that their attention and subsequent changes in behaviours were the fundamental parts of entire markets would be conspiratorial, but I might be misunderstanding you.
2. You are compensated by accessing an incredibly complex system and network for free where otherwise you would have to maintain or pay for some kind of infrastructure.
(I am playing the devil's advocate here because it is interesting to me to understand in what way other than granularity this would be any different from the way the media has been communicated to us for a long time)
I'm not sure why saying to people that their attention and subsequent changes in behaviours were the fundamental parts of entire markets would be conspiratorial, but I might be misunderstanding you.
[0] https://en.wikipedia.org/wiki/Nielsen_ratings