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I have noticed this. And it ain't good, at all!
Until now, it should be a lot of artificially discovered concepts around, but which are nowhere to be seen!
Perhaps it's a low hanging fruit?
I expect that may be the case. Colton and a few others were working on similar stuff in the late 1990s and early 2000s but there's been less interest in the last few years. I expect that will change soon.