Part of the problem the NFL runs into is a matter of who is in charge. Remember the commissioner works for the owners, so his level of power over them is limited. And there’s CBAs that include punishment limits for the players, coaches and refs.
The biggest punishment on the NFL books is draft pick removal. And they do it, though not lately, mostly because nobody breaks those rules (cap violation, and interfering with player contracts are the big 2) anymore. So maybe the penalties are enough.
Makes you wonder why more teams don’t cheat. .. at least to the extent of some teams. Oh, that’s right. .. integrity. I guess nice guys finish last. ..lol. I think some of the teams realize they aren’t as “tight” shall we say with the league HQ so they probably can’t get away with as much. There are definitely the “haves” and the “have nots” in the NFL IMNSHO.