Earlier quoted context omitted.
I agree except some things are actually addicting. Phones are dopamine slot machines that fit in your pocket so that you can't escape. I think it's both. People seek an escape and phone apps are extremely addicting.
Is it bad to feel rewarded for legitimately engaging your brain? Is it bad for something to be a "dopamine slot machine" if it's only because it actually allows you to consume knowledge more rapidly/efficiently?
The answer to your question is it depends... I don't think there is anything wrong with playing a dopamine hitting game on a 10 minute bus ride home from work (it's no different than the buzz from a shot of espresso), but if you are spending so much time that you are harming yourself (physically or emotionally) then that's an addiction.
There was a talk posted a few days ago here by Dr Gabor Mate about addiction:
(Skip the 10 min intro, then watch at least the first hour)
His views are very different from the mainstream US view of addiction being substance abuse that can be fixed by restricting access to the drugs.