> Who says it isn't?
Me. And, I believe, the vast majority of other humans who have given it any thought.
> They don't? Why not?
If you feel that way, you must also believe I have the right to display whatever I want on your devices. Which you naturally agree I do, right? I hope you like very early morning disco...
> it seems obvious that they can say "in exchange for sending you this video you must watch the ads".
People can say whatever they like. Like, I can say "for reading these words, the person behind the insanitybit account owes me $20."
Tell me, just how obligated do you feel to pay that?