Not surprising:

It’s no surprise, really, that the wealthy and educated are the first to enroll; this is a similar pattern to the take-up for other technologies. There are several basic requirements for enrolling in and engaging with these courses that are readily available for such populations but are serious barriers for large portions of the world. These include regular access to a computer and high-speed internet, a level of previous education that’s sufficient to understand university-level content, the ability to understand courses offered almost exclusively in English, and enough free time to study for several hours a week.