I think we all know that some teams cheated during their games. I'm not gonna use any teamname or name any player and I hope everyone responding can keep names out aswell.
If anyone figures out that there are moments you can look at the full minimap without getting scolded then they will abuse it.
The moment you realize this you'll start to think: "Oh, the enemy team might be doing this for a while already. You start to think that one or the other move they pulled off they only did because they knew your positions (might be true, might be luck) and you start to cheat aswell. You don't want to be the idiot-team who doesn't abuse the ability to check enemy positions when the other team already abuses it the whole time. The only way NOT to cheat after figuring it out makes you feel like a complete idiot. Since it is not human nature to love feeling stupid and cheated on you start to use what you've been giving aswell.
I don't blame any team for doing what they did. However I am seriously disappointed in the people who designed how the stage is set up. The shoutcasters were aware of the possibility that players can watch the screen during pauses. Why giving the teams the chance to cheat when you could set it up differently to make it harder/impossible?
Imagine in football/soccer if the both teams pep-talk would be slightly listenable from the other dressing room, so you can hear it only if you press your head against the wall and all the refs say is: "But you're not allowed to listen."
Nobody would like this. Nobody likes it in LoL.
You can't tell how even one glimpse decides the outcome of a match, maybe it's gamechanging, maybe it's nothing to care about. In my opinion Riot should watch every replay to figure out who was cheating and REPEAT those matches. They have one week time now thanks to the Internet issues they've had anyways. I want the winners to win in a fair match without any doubts of cheating and what not.
tldr: Whoever decided it is okay for people to be able to watch the bit-screen is bad and should feel bad. Matches with confirmed cheating should be replayed.