Point of clarification: Spygate was about the location of taping signals. It was outside the designated location. All teams still do have the right to tape signals and most do to this day! It was all about where they were doing it. It was kind of a weird rule anyway since they had the helmet microphones for QB's and a defensive player by then. You really didn't need signals. As long as you covered your mouth while you were talking then there was nothing to steal. All teams go over down/distance tendencies anyway.
I'm not a Patriots and in fact don't like them however the level of ignorance on what they have been punished on is remarkable. The deflategate thing was simply Goodell being a tool because the other owners were jealous. The league still doesn't check/record each football which is what they should do if they cared about it. Plus if fairness was an issue why do the refs have full time jobs doing something besides officiating????