I don't know for sure if you can call it addiction to dopamine (and I don't think it matters) but I know for personal experience that hits of dopamine from videogames, watching anime or series, PMO, wasting time watching Facebook, instagram or YouTube, etc, makes you want more hits like that or bigger, and at the same time makes you feel like real life is less attractive, or even boring, because your brain already have a better, faster and a lot easier to get dopamine source.. basically, making you half zombie lol. Again personal experience, since the day I quit Facebook, Netflix and videogames not only I was able to control myself to not PMO, but also replaced that sources of dopamine that kill your brain cells with sources of dopamine that makes you grow. Making exercise, talking with friends and family, studying, meditating, etc. Like you said, dopamine it's supposed to be motivation ¿for what? For doing stuff that's actually good for you, that's when dopamine is healthy. If your dopamine source is videogames or anime, don't lie to yourself, it is not healthy at all.