Well, I should say thank you for this video. He is really clear why this is cheating and how using our own intuition to steal signs is much different. I still wonder exactly what the rule book said, however. Here is an explanation, but all of this arises after the facts, so it's in some ways bogus. I am not saying what the Astros did was justifiable, but they could claim that the rules were not clear enough on what constituted stealing...although some of them felt enough guilt to do a mea culpa. (There are a few articles here and although the video provided is pretty convincing that the rules are clearcut, several of these articles seem to say that the rules were not very clear at all.) https://bleacherreport.com/articles/2821237-mlb-reportedly-adding-rules-for-cameras-video-to-restrict-sign-stealing https://thebaseballcodes.com/category/sign-stealing/