It's quite possible that those guys will be fined, but the conspiracy runs much deeper than that. It appears that the FO may be the masterminds behind the plot.
Kevin Goldstein, a high-ranking FO executive, reportedly sent out an email asking scouts to spy on the opposing teams' dugouts.
"One thing in specific we are looking for is picking up signs coming out of the dugout,” the email, disclosed to The Athletic, read. “What we are looking for is how much we can see, how we would log things, if we need cameras/binoculars, etc. So go to game, see what you can (or can’t) do and report back your findings."
https://www.si.com/mlb/2019/11/17/astros-executive-email-cameras-steal-signs