Yawn. This has been debated ad nauseam. If you want to feel that way it's up to you, but disclosing means and hidden information has never been a requirement for open source. As long as the thing is licensed under a permissive license (MIT in this case), and you can see the data, change the data and re-publish the data, it's open source.
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DeepSeek is not open source, as the source of its 14.8T high quality training tokens is not disclosed.
At some point this becomes No True Scotsman. They have disclosed a lot
Yawn. This has been debated ad nauseam. If you want to feel that way it's up to you, but disclosing means and hidden information has never been a requirement for open source. As long as the thing is licensed under a permissive license (MIT in this case), and you can see the data, change the data and re-publish the data, it's open source.