No shit?
Jokes on them. I already use generative AI to impersonate myself on LinkedIn.
Or.
Delete your data, if you cant delete it, edit it.
Then Leave the platform
There are very few places on the Internet where your data won’t be scraped and used for AI training. Every social media company does this, including Discord and Reddit. Federated platforms are quite easy to scrape (not sure if they are yet). Even if you make your own website, it’s definitely going to be scraped by crawlers from every company wanting to make AI.
It’ll be very hard to prove they respect the button. Considering they probably sourced the data immediately after the button was put in place.