> It's a ridiculous conclusion to draw.
Not really. My guess is you're young enough that you never had to deal with AT&T in their prime. Packet prioritization is the very beginning of what carriers would like to happen. But once they get it, each succeeding step gets easier.
The basic view of a dominant carrier is that they should get a piece of everything that passes through their network. Everything. And because they're enormous, they really only want to deal with other enormous entities. It's most convenient for them to skim 30% of everything if they deal with just a few other players who are also monopoly or oligopoly players.
Try to imagine what the Internet would be like if Ticketmaster were in charge. Or if you'd like to read the history, When Wizards Stay Up Late, an origin story of the Internet, gives some of the flavor of how much AT&T squeezed everything.
Or you could look at the history of the answering machine. It was originally invented by AT&T, but they suppressed the invention out of fear that it would cut down on call revenue. [1] They fought tooth and nail against letting other companies sell them; it wasn't until 1956 you were even allowed to strap something to your phone [2], and they prevented people making electrical connections to the telephone network until 1968 [3].
[1] https://en.wikipedia.org/wiki/Answering_machine
[2] https://en.wikipedia.org/wiki/Hush-A-Phone_Corp._v._United_S...
[3] https://en.wikipedia.org/wiki/Carterfone#Landmark_regulatory...