> There’s nothing proprietary or original about eg. the syntax of a for-loop, or the boilerplate of setting up some JS framework MVC.

Of course there is something proprietary or original about that. Why else would they need such an enormous AI to suggest it. Auto completing simple boilerplate was already solved in a much simpler way.

> Copyright infringement hasn’t taken place until the user activated the autocompletion and actually placed the code within their own and released their code containing the infringing code.

Copyright infringement takes place as soon as some company publishes/sells material without explicit license or permission. So not the moment the users hits accept, but the moment just before that: when the tool shows it to the user.