But this seems to be neither software nor does it actually make it more difficult to sell data. Its a servive that sends opt out requests for you. As far as I can see there is no legal value to this, nor is this sustainable - the next scrape and you're back in. There is (obviously) no guarantee that you data won't be sold, nor any guarantee that their opt out requests don't become basically a signal for 'this is a real person with money to spare'.