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What does «GM mystery cult» mean and where does it come from?

As far as I understand, the term is sporadically used in the indie community or former Forge diaspora. I searched for it in the Forge archives, but got no hits.

What is the source of the term and is there a clear definition?

My current understanding is that it refers to the game master not being open about their methdology for running the game; whether they have a plot railroad or not, what they improvise versus have prepared, whether they fudge or not; and generally the social expectation that these are secrets the game master should keep.