I think the online educational resource availability follows from the field dynamics. Python is python no matter whether you're in India or Hawaii. Law is specific to geographies. Law schools generally either focus on their regional context or, at the very top, teach theory instead of practical law (e.g. Yale).

In that context of fragmentation, it's hard to imagine what an legal 'codecademy' would look like. You can't properly teach theory without a strong writing component, and the professors to review it would put you back into the cost structure of a full university (don't think a neural net would cut it, at least within the next decade). For a bunch of multiple choice on practical law, you would need to restrict your coverage to a specific geography, not to mention a specific field, limiting the market for such a service.

I guess you could start with the uniform criminal code + uniform civil code in the USA. Maybe common law principles too.

While it's generally great for people to learn to code as a hobby or for personal projects, I can't think of viable personal projects within law -- just as you wouldn't want to encourage personal experimentation in medicine. Likely the audience would be people trying to better understand their own problems with the law, which incentivizes Dunning-Kruger or law students, who are already in / will be law school. Unlike coding, law school degrees are absolutely required for the vast majority of legal careers.

I think the success of online legal resource providers like Clerky or LegalZoom is that they help non-lawyers navigate the law (outcome-oriented), rather than being a general educational resource.