After-the-fact opt-outs are something I never trust. Most data selling is opt-in and requires the user to opt-out. It seems to me that when I submit the form, the data would be instantly sold and by the time I get to the opt-out form it’s too late.

If this isn’t how it works, I’d be interested to know. The whole idea of these opt-outs seem like smoke and mirrors to act good while still gaining the advantage from the dark pattern. The only way to truly opt-out is to not register or use a service at all. There really needs to be legislation around this.