So despite them making a big deal about protecting users, you can't really opt out at all. Consider:
1. If you have personal drafts, you may now have to make a choice between paying for a professional plan indefinitely and having to delete your files, if you don't want them going right into OpenAI's gullet.
2. Pre Adobe purchase, I hired a contractor to do some work for me in Figma. Now unless I run around making sure no early-stage work product is in their personal drafts, OpenAI gets copies.