The NFL's contracts with CBS and Fox require that NFLST have a minimum price in the $300 a year range, in an effort to protect the local audience of CBS and Fox affiliates
Additionally, I think Apple wanted to do unique things with the broadcasts and might have even wanted to produce it themselves, but Sunday Ticket is literally just rebroadcasting the Fox and CBS productions of the games
It wasn't as much about the NFL just expecting to get its way, Apple was also kind of over-expecting on their end too and not understanding the thing they were bidding on. The types of changes Apple wanted to do were never, in a billion years, in the cards