As the linked page points out you can turn this off in settings if you are an end user or choose zero retention if you are an API user.

I mean, they already stole and used all copyrighted material they could find to train the thing, am I supposed to believe that thry wont use my data just because I tick a checkbox?

Agreed, I have hard time believing anything the eye scanning crypto coin (worldcoin or whatever) guy says at this point.

I wish I could test drive your brain to experience a world where one believes that would stop them from stealing your data.