That hasn't been my experience. When I've used the tools, the opt-outs have failed for the majority of the companies in the list (as reported by the site itself).

That said, as you point out, they're pointless even if they worked correctly as you still have to engage in all the blocking that you usually do regardless.

> (Oracle's just shows you what data they know about you, it doesn't actually delete or opt you out).

Ah, so Oracle's offering is worse -- worthless by design rather than implementation.