Meta has announced that it will begin training its own AI using data from European users. The company claims that it has a legitimate interest in this practice. Users can object to the use of their data; however, there have been complaints regarding the procedure for submitting these objections.
To object, users must fill out a form, detailing how the data
The only exception is private messages, and some users have reported difficulty opting out.
Worked easily for me. Perhaps you need some kind of general data protection regulation in your area.