To be similarly pedantic: Ctrl+C is a hotkey that sends the corresponding ASCII code / codepoint to signal something, it is not an ASCII code itself.
You could have the same character be sent by using Ctrl+Q (if you were to remap it), and not break compatibility with other processes while doing so: the codepoint being sent would be the same. From a technological perspective there is nothing special about the key combination Ctrl+C specifically, but altering this behavior in a terminal absolutely wreak havoc on the muscle memory of terminal users, and altering it's behavior in a text editor on everyone else's.
MIT still requires the license and copyright notice to be maintained though, it is why even proprietary software includes an 'open-source licenses' listing somewhere under help / alongside the distribution. Arguably, AI models reproducing a bit of MIT licensed code would be just as much in violation as with any other license.
GPL still gives much better guarantees w.r.t. providing the source code and modifications made thereto, though.