here's the wired article. https://archive.is/FZvCD
here's instruction on how to opt out, by the SAG-AFTRA actors union.
If you want to avoid these AI generations of your Instagram posts without switching your account to private, you’ll have to dig into the app’s settings. Open the Instagram app, tap your profile, and then tap the three lines in the top-right corner of the screen. Then, scroll down to the Sharing and reuse tab. Here is where you should see a section labeled Allow people to use your content on Instagram and with AI features on Meta, with a toggle for Posts and one for Reels.