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Facebook admits to scraping every Australian adult user's public photos and posts to train AI, with no opt-out option.
(www.abc.net.au)
But why would you want to opt out of this, Luddite? 
When this conversation comes up, my go-to is talking about people getting doxxed who were innocent. Boston Bomber, that airplane doctor, a lot of kids/minors, etc. It's easy for people to grasp they can randomly be targeted by a lynch mob because they look like someone or their name matches the wrong guy.
You can also get into deep dives on people finding out where a photo was taken just by looking at things like which way the wind was blowing, contrails in the sky, or where the sun is. You explain this can be used to track their kids or find out where they live.
Furthermore, just by figuring out a person's relationships, people can figure out important security questions (mother's maiden name, where they went for third grade, etc.). These can be used for ID theft.
My concern personally is there's no protections on privacy. As we've seen with the repeal of Roe v. Wade, social media and electronics can be used to track people in order to convict them with crimes. This can happen with any issue. Republicans may be fine with abortion being outlawed, but how are they going to feel when democrats finally repeal the second ammendment and throw them into FEMA camps or whatever nonsense conservatives are thinking of? The government can figure out if you're part of a gun club or maybe sees you in the background of your friend's picture at a shooting range.
You start piling on bad things that can happen to them and people start realizing they need to delete Facebook and Instagram.