[aaron695]

Alternate theory, MOOCs got lectures put onto YouTube.

And this is what the early success really was.

It'd be interesting to see if what they "up-skilled" on is now common knowledge in Data Science.

[rgavuliak]

I think especially for Data Science, a lot of the curriculum got taken over by universities and new university programmes for Data Science were created since then so in a way it became common knowledge for fresh graduates.