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These things look neat, but wouldn't this be teaching programming at scale? The phrase "learning programming at scale" leads to the idea of someone trying to learn how to program who is also able to repeatedly enlarge the amount of stuff that s/he is able to learn at once. That's...not really what's going on here.

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Also, doesn't this only work with intro materials that only have a few lines? How's this way of teaching programming going to work if the program is hundreds of lines long, across multiple files, or have more than one correct solution? The debugging time alone would go up very quickly

Right and that's why there's things like AirPair where the cost of tutoring goes up and is paid per minute due to the complexity. This scaling has a limit but it's the same as any other field; how many artists go on to be great artists after all?

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