Since you need to pass tasks before you get on to the next video, it means you really learn and pick up the skills rather than just watch a video, think you learnt something, and then move on to something new. That's not for everyone but that sort of enforced progress clearly has value for some - only you will know if that approach suits you though.
To me, it's definitely worth it for people trying to pickup a new skill like programming.
I hope they pitch this to schools, particularly middle school and high school. Something like this could potentially handle the curriculum for a programming course. It would be a lot less expensive than paying someone full time to teach a course.