Yeah, I totally get this. Given the nature of the mode I doubt they'll be any packages depending on it. (currently there are none to my knowledge) If this changes we can discuss moving it to GNU ELPA.
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> I prefer NonGNU ELPA, so we won't create obstacles for new
> contributors. Few people are excited about contributor agreements.
It depends what other facilities will want to use this and how.
Packages in Emacs core or GNU ELOA must not depend on packages in
NonGNU ELPA.
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