Sounds like they just stopped dopamine saturating themselves. If you’re constantly seeking dopamine-producing activities, your receptors straight up stop being able to uptake more dopamine, and I’ve heard that dopamine overproduction can wear out your pituitary gland so that it stops producing enough (this is mostly noted in drug abusers). So there’s a school of thought that engaging in less dopamine-inducing activities helps you have a healthier baseline where your brain experiences more enjoyment out of regular activities.

I have only ever encountered these talking points in passing so i have no clue if it’s true.