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CS may be the faster growing field in the arXiv over the last decade but it was relatively late to the party. https://arxiv.org/help/stats/2017_by_area/index

From an outside perspective it appeared to me that the leaders in this were actually the physics and mathematics community, rather than ML.

Physics and other disciplines were broadly using arxiv before ML did it. When I switched from physics to ML (CS) I was surprised that arxiv isn't used more.