I think the term addiction is not the right term for the discussion. Because there are actual addictive games, designed to be so. Often including real money. Some are even outright gambling games, like online casino and such. Others try loot box mechanics or try to obfuscate the gambling.
And of course, people can get behavioral addiction to just about anything, like watching tv or checking social media. No need for broken promise, or gambling mechanics. Tbf one can get addicted to video games, but also tbf, one can play poker without being addicted to it.
Good rpg games just pull you in, like a good book would pull you in, prompting you to read it in one go, if possible. You would not call the urge to read that book an addiction. Well, you might, but you would not mean it in the pathological sense, but as a figure of speech.
That chain of satisfaction you mentioned is just the fact that a game is interesting and keeps being interesting as you play it. Or fun. Challenging. Immersive. Whatever the good qualities of the game are. Which is a complex question for rpg, because they have so many different things that can be fun in different ways.