I used a tool like this posted to HackerNews a couple years back (against my better judgement, eh), and the information on a few of the data brokers afterwards was not only not removed but actually showed a green checkmark ("verified").
It's entirely possible the data brokers are simply using the "opt out" requests as a way to validate the data, but it's just as likely that the tool works with the brokers to confirm information instead of actually removing it.
It's entirely possible the data brokers are simply using the "opt out" requests as a way to validate the data, but it's just as likely that the tool works with the brokers to confirm information instead of actually removing it.