Speaking of the union, they released a statement on this yesterday. They say that MLB rules did not allow discipline of players over this, because under current rules and precedent, it is the club personnel's (non-players) responsibility to ensure compliance with electronic sign stealing rules.
When MLB went to the union requesting player cooperation in the Astros investigation, the union said they'd only permit that if MLB promised not to try to discipline any players. They got that confirmation, and the players interviews started days later.
Now they say they're they're negotiating ways to deal with future sign-stealing issues, and that "no issue is off the table", including player discipline. (though I'm sure they'd want something in return for bending on that.)
Evan Drellich on Twitter: "The MLBPA just released this statement regarding the Astros investigation: "Any suggestion that the Association failed to cooperate with the Commissioner’s investigation, obstructed the investigation, or otherwise took positions which led to a stalemate... is completely untrue."… https://t.co/TY1DgJOZl3"
So let's not pretend the players are angry no players were disciplined. Maybe a few stray voices will say that, but it's not the union's position. Players fought drug testing for years and years even though it gave players and teams competitive advantage to use banned substances. This is a business for them, they don't look at game outcomes and cheating the same way the fans do. The players who really lost the most here were the ones whose careers were impacted - like that middle reliever who got lit up against the Astros and never saw an MLB game again.