“Gaming the system” means your metric is bad. In Darwinian evolution there is no distinction between gaming the system and developing adaptive traits.
Well, it means your metric is flawed/imperfect.
That doesn’t imply that it’s feasible to perfectly specify what you actually want.
What we want of course is for the machine to do what we mean.
There is no "gaming the system" in Darwinian evolution. You reproduce or you don't. There's no way to fail reproduction and still perpetuate your genetics.
In evolution there is no metric, that's a human made concept. In evolution the thing that kills you also evolves. The "metric" evolves.