When doing any kind of user behavior funnel testing, regardless of what the product and feature actually are, and largely regardless of how prominent you make t

When doing any kind of user behavior funnel testing, regardless of what the product and feature actually are, and largely regardless of how prominent you make the on/off switch, you find that the same tiny percentage of users that would turn it off is equal or greater to the percent of users who would turn it on. So if you want lots of users to use a given feature the only reasonable thing to do is turn it on by default and make it opt-out.