Spiking dopamine levels with pharmaceutical drugs can do this in animal studies, but watching a show on Netflix or eating a donut is not the same thing.
The simpler explanation is that people who spend all of their time passively consuming rewarding activities (junk food, TV shows, Twitter, Reddit, porn) are getting terrible nutrition, very little physical activity, and no real social exposure. They're also piping a constant stream of negative news and unhealthy debates into their eyes and ears.
Going outside and going for a run is also rewarding and can also be shown to elevate dopamine levels, but nobody is going to argue that it makes you "feel shitty and unmotivated".
You can't reduce everything down to one, singular chemical in the brain. Human psychology and motivations are complex and not a function of singular chemical "levels" in the brain. Reward is also a complex topic that involves multiple systems across the brain, especially opioidergic pathways that moderate much of the sensation of reward. Dopamine is also used for functions like movement (think Parkinson's) and even encoding negative stimuli that you dislike.
This pseudoscience idea that "dopamine equals motivation" or that you can modulate your entire motivation/reward circuitry by playing games to modulate dopamine is an egregious abuse of the science.