Copilot is different - it clearly takes a lot of skill and effort to turn a bunch of GitHub repos into a fancy autocomplete system.
About deploying the model - it just needs to filter out verbatim exact snippets so it only outputs original, unattributable code. That can be done by hashing ngrams and a bloom filter. The vast majority of code generated by Codex is original anyway.
By the way, Codex is good for many other tasks, like, parsing the fields of a receipt, or extracting the summary of an email, or generating baby names, it's an all purpose NLP tool. Just call it like a function. Code completion is just one thing it does. It talks pretty great English, can compose poems.
That's a setting now.
Copilot isn't honoring the license, so why does it matter whether it was under a restrictive or permissive license?