An email from GitHub Support. Name of agent is censored. Relevant part reads 'Sorry about the delay in getting back to you. I reached out to the team about this. Apparently all public GitHub code was used in training. We don't distinguish by license type."
https://cybre.ams3.digitaloceanspaces.com/media_attachments/files/106/539/160/894/247/263/original/5178de045437e6d6.png