This exists already, but I feel it needs to be more explicit.

There is a platform, where people can upload videos or written materials about classes. Unlike Youtube, only classes go here. It is really not a place where you will find yourself looking at kitten videos when you were supposed to be studying. Anything is valid, from Programming, to Languages to Astronomy.

I believe that the classes should be completely modular. This class is about this specific topic. In my experience we go to the Web to study when we are interested in a particular thing.

Thing is, we spend a lot of time trying to find really good class. And this is a lot of wasted effort because many people before have searched and found suitable classes on the subject. 

So this platform would rank the classes in multiple categories (boredom, accuracy of information, brevity, clarity, depth, visual presentation). Not just a thumbs up. There would be a competition to get the best class to top. Perhaps right now you are looking for a class that is short; maybe you have the time for a more in-depth discussion; Maybe what really helps you to learn is graphics. 

The idea is to create a strong community where people share their knowledge and perhaps answers each others doubts.

As a business, I believe it should be very open, not locked through a pay-wall. Pesonally I'd be a lot more happy if this was actually a non-profit project. Content creators are paid by ads, company gets a cut. Aditionally, the company could be approached by other institutions to sell referrals of their best users, with the purpose of settling them teaching jobs. Participation in this would be voluntary.

It is entirely possible that this already exists and I haven't found it yet.