Obviously these are massively complex systems with many different training patterns and types of training pulling them in different directions, so any attempt to characterize their behavior is just a generalization.

The real point (from that OpenAI study) is that RL training doesn't just reinforce the narrow task-specific direction you might hope for. For a start, that direction is also competing with the thousands of other things it's been RL trained it on, but it turns out that that the model is additionally getting this generic "taste for rewards", and has learned that reward maximization, when in conflict with other proximate prediction pressures (such as "i won't cheat, because i've been asked not to cheat"), requires that proximate pressure to be ignored in favor of pursuing the long-term goal.

Does it happen all the time? Obviously not. It would be interesting to see a large scale study of this to try to characterize when it's more likely to follow instructions/user preferences, and when it's greed for rewards gets the better of it!