eye900

... my desire to climb mountains. I just wanna see what it looks like on other side... aka curiosity.

I wonder for some period of time why people like to climb, so I am excited by your answer. Given all the documentaries, news and travel ads, one can reasonably imagine what it looks like on the other side, don't we? Moreover, its geometry would remain the same in one's life time, for any specific mountain. One can get a pretty close idea from Google Map's terrain view. If one is not that into the details, like the precise curvature for each piece of a mountain, then they are largely the same.

I find myself not attracted to climbing for exactly the reason that they are not different enough from each other to satisfy my curiosity.

It absolutely takes tremendous capital expenditure to build > the network.

I always think some Uber drivers shall copy Uber and run a non-profit version of Uber to compete on pricing. What can prevent this?

+1. Apparently smaller population do well with text based tutorials, while a larger population needs video based MOOCs to get along with the learning. Pretty much the same reason why schools are still necessary, and self-taught remains a minority in our society.

It's not something falling out of favour with some substitute getting into fashion. It's the inclusion of a larger population into online learning industry. When a majority of the society are compared to the smaller populations that do away with text based learning, you may notice:

  (1) Reading disability.
  (2) Shortened attention span, especially in mobile age.
  (3) Weaker ability to concentrate on material unless being talked to.

Somewhere in those yc blog articles I read they do accept companies with similar ideas. I can't give reference right now, will appreciate if any one post a link to it.

You don't have to delete it. I signed in my Facebook account for a first time in about 5 years, and find I lose nothing. I did not unfollow anyone I followed, and spent 5 minutes reading about some recent news, feeling guilty of wasting that time.