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How do you know it is satire in that case?
Because:
They pretend words like Karen or Boomer are slurs
They censor the words g#me, g#mer and videog#me
They say Hitler invented videogames in 1939
Most of their proof is photoshopped images (example)
Most of the users active in that sub are actually also active in gaming subreddits
They call their subreddit a “facebook group”