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70k / $5k = two weeks of wages. This is not peanuts; think about how much you make in a month and setting fire to half of that.

Over what time period? Lots of people probably spend 2 weeks of wages per year on entertainment of some kind.

I would go as far as to say that any expensive hobby would take 2 weeks of someone's yearly salary. This could be music (listening or making), golf, photography, painting, Blurays... Tons of things.

The article says: >For this video, The Wall Street Journal met 31-year-old Daigo, who dedicates most of his time—and financial resources—to “Fate/Grand Order.”

Thus, it explicitly says he spends "most of his financial resources" on the game. For anyone to spend > 50% of their financial resources on a video game is clearly indicative of an addiction.

He also implies he lives with his parents, since he says he cleans for them when they ask.