If you are under a retention order, yes, you can get in trouble.
Epic has some reasonable arguments there when i read it. I thought actually some of this was already resolved in Epic's favor, and some in Google's, and they were only trying to figure out sanctions or something.
It's a complex case (well set of cases, really) so i don't remember all of the state. I think it's that their is one in DC where they are trying to decide on the motion, and one in California where they are trying to decide on the penalty.
The DOJ's argument, meanwhile, or at least part of it, was not about retention but about reasonable anticipation of litigation and coverage.
They basically were arguing (again, in part), that since they started investigation in 2019, Google should have saved all chats from all employees since then.
That particular argument seems unlikely to fly.
A more targeted argument might stand a better chance, but when they argue crazy things, it doesn't help convince a judge that the rest of your argument has merit.
These sorts of arguments always get thrown around anyway.
In litigation this large, everyone claims everyone should have disclosed something more, or saved something, or ...
Sometimes they win, sometimes they lose.
That doesn't mean if someone did something wrong they shouldn't get sanctioned, but like I said, it's not uncommon.
It actually used to be worse.
Before some rule changes about 2 decades ago, people used to end up spending more time arguing about sanctioning each other than the actual case took, and trying to get money for it.
It's more reasonable now, but yeah.