The thing about what the Houston Astros did, which cost their manager and GM their jobs, was they took something everyone in baseball does -- stealing signs -- and used video to elevate it to a place that was unacceptable.
In football, at every level, everyone steals signs. If I can steal yours, it's on you to change them. Watch the line of scrimmage when a quarterback is going through his cadence and every linebacker seems to react and signal to his team what's coming based on a check they hear. It's because stealing signals -- at a basic level -- is an understood part of the game.