I helped my better half submitting a request to withdraw consent for this, and it took all of 14 minutes to find the form, fill it out, and copy the email confirmation code (like, why the fuck?) to get the message through
If you still have a Facebook account, I would suggest that now is an excellent time to delete all the content and upload a ton of random mutant scribbles to screw with their training data.
You want to screw with my data?
My data will screw with you.