This assumes people training AI are going to put in the efforts to extract metadata from a poorly specified “format” with a barely coherent buzzword ridden README file. Realistically, they will just treat any .meow as opaque binary blobs and any png as regular png file.

Hm, I'm not really sure why this is getting downvoted because — yes, I also had the same impression. The format was only barely specified, and the readme was incredibly sparse with a lot of marketing bs.