I don't think there is collusion. All the owners were probably individually pissed at Haslam for the Watson deal, and individually decided not to ever do deals like that.
If I'm the Ravens though I still think I would appease Jackson. Either: Jackson gets seriously hurt and you're screwed and you suck for a few years dealing with the contract; you trade Jackson and suck for a few years anyway dealing with the severe drop off in talent at QB; 26 Year old Lamar Jackson gives you a few more MVP calibre season and you compete for the AFC/Super Bowl. I think I would play that lotto ticket.
On a more macro level, it is dumb that for as much money as the NFL makes that Lamar Jackson can't get the same deal as Bradley Beal (or any other random athlete), and I think that even if you spend a day on an NFL practice squad your income for the year should be guaranteed, and if you play a snap in the NFL you should have health insurance for life. But that is all a much larger issue.