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.”

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.