This form is legally binding and has more legal weight than just clicking a toggle. If they still train on my data, they can get sued, and I'll get a payout.
Fighting legally against one of the richest companies in existence, with the entire American apparatus behind it, is a brave move
How would you prove they trained on your data specifically?
Are there any precedents that companies got sued on this? Not that I doubt you, but it would be nice to see if it actually has teeth or not.