This is what I came here to post. I think there are use cases for something like this (learning a new language), but it's going to be really difficult to get this into B2B territory for the reasons you mention. I would focus more on the educational aspect of this, like you get personal feedback from a mentor on how your programming ability is going. The main competitor here is contribs to Open Source, where you'll get lots of tips on style and integration for free (maybe too much so).
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