I have a connection to a current player, which doesn't mean I know a damned thing about anything, just that I hear tidbits. From what he said, every team has/had a system and everybody knows it, which stands to reason and is supported by circumstantial evidence. And he pretty much had the same thoughts about the pearl-clutching response that Evan Gattis recently shared.
From the Evan Gattis article in the Chronicle the other day:
Gattis, who said he and his teammates believed they were just keeping up with what most of the other contending teams already were doing, also said it was no secret around the league what the Astros were doing, especially after White Sox pitcher Danny Farquhar let the Astros dugout know he could hear the banging while he was on the mound during a game in 2017. Gattis said the only reason no team spoke out at the time about the Astros' system is because they didn't want Major League Baseball to look into what they were doing on their side of the field.
He said that's why his former teammates took offense to players from other teams - like the Dodgers' Cody Bellinger - saying the Astros didn't earn their World Series title.
"There’s people in our clubhouse who have had to call other people from the Dodgers clubhouse and say, 'Hey you need to clean up your shit, because, yo, we know, bro. Why you gotta be like that?,'" Gattis said. "Everybody has a system," Gattis said. "Everybody knows a buddy that has a buddy that’s on the Dodgers in the baseball world. It’s like, 'Yo, we know, so you guys got to kind of chill out with that shit.'"
https://www.chron.com/sports/astros/article/Evan-Gattis-Astros-cheating-Dodgers-signs-podcast-16282495.php