The NFL “Hard Knocks” show is a lot more popular with the fans than the teams.
Many teams don’t like the idea of cameras being in their inner sanctums in camp. They sometimes act as if they were working on The Manhattan Project instead of putting together a football team.
And since NFL Films produces it, there is little chance a team will be embarrassed.
Still the NFL had to put together guidelines for teams that can’t turn down an invitation so they all can’t refuse.
If a team has a new coach, has been on the show in the last 10 years or has been in the playoffs the last two years, they can’t refuse to do the show.