If I was paying for work and the contractor was uploading the end result onto some sort of shared AI training set, we would not be working together for very long.
You may have brought up an excellent point that needs to be inserted into new legal contracts — either an opt in or out regarding the use of tools of various kinds that upload data into the cloud to “help” you. Maybe other companies would be okay with stuff like Copilot if it allows them to pay less money for developers who can’t write proper code without it, or something. I don’t know. I know that I want nothing to do with these sorts of systems, and I don’t want any of my code anywhere near it. I’ll definitely try to make sure nobody with access to my private repos has any of that nonsense enabled.
Maybe the legal version of Copilot can write an appropriate contract clause for us?