Haha. I am 100% these companies will ignore this if they choose to. Just as they played fast and loose with copyright rules.
They would do it, the say “ah sorry chaps, impossible to extract it from the dataset by now, anyway we anonymized it so can’t tell what’s what, and we can’t risk losing to China. Oh look - did you see Superman fly outside?”.
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.
European users have right to be forgotten. Waiting for the court order to delete all models.