Ah okay. I know why they do it. "Addictive" has a negative connotation so they're forced to put the positive spin on the other word. Perhaps you knew this. I can see why it would bug you.

My pet peeves

Antisocial vs Asocial. I want antisocial reserved for psychology and being a loner to be described as asocial. So I really like Kendrick Lamar's line about being an "antisocial extrovert"

Also Reactionary vs Reactive.

To be someone who reacts to everything is to be reactive. Reactionary should be reserved for politics

I use the bleeding of both abnormal psychology and backwards politics into apolitical discourse a part of a trend of western decline

Addicting being spun as good is a great example of that.

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Dunno. Maybe further west. I've been in the North and South and really only heard addictive.

That said I don't play videogames and haven't for over a long time. I remember the site addictinggames.com. I think it easily could be a videogame dialect. Remember way back when I was a kid my mom would bitch that I was addicted to certain games. It's been well documented as addictive. Easily could be clever marketing from game companies to create a word. It also could be intentional slang to mimic kids misspeaking and it caught on.