Lots to gain from those illegal films— otherwise they wouldn’t have risked filming.
Lots? Do you have any idea whatsoever what the issue was? How does that compare to say, an assistant coach changing teams without getting a lobotomy? Do you have any idea how simple it is to encode signals, or to change the code?
Once it is known the signal code was cracked (which cracking is an absolutely legal enterprise), the information become useless unless the other teams are simply stupid. It's not like the signals are hard-wired into expensive circuitry. There are dozens of ways to change them in just minutes.
“Once it was known...”
And no telling how many years it had been going on.
No way around it, definitely an asterisk team.