Research has shown that providing users a choice between Optin and Optout, results in more optins, than if you just have a box to OptIn, and the default is opted out. People generally take the path of least resistance, and if the default is to submit without making a choice, they do so. If forced to make a choice, they consider the options, and more choose to opt in. Do your consent features provide this option?

There have been several articles like these: