They try every way they can to force money out of those who sign with the only opt out seeming to be to advertise them on your own social media. If you sign something they then without you knowing you've given them permission send you an email prompting you to sign something else (give them more money). Apparently change uk was started as a charity for altruistic reasons until somebody mentioned that they could con bug profits from people. They become user rich by conning us.