I wholeheartedly agree with you. A world of centralized monopolies is quite a scary prospect. Less so when they are not enforced by government, but concerning nonetheless.
Thiel's monopoly idea might encourage someone building a new repository hosting thing to focus on a particular underserved segment and get everyone in that market.
"The thing that’s always a big mistake is going after a giant market on day one because that’s typically evidence that you somehow haven’t defined the categories correctly. It normally means that there is going to be too much competition in one way or another."
However not everyone in tech feels this way. I detect this sentiment in the parent. See: Peter Thiel's thoughts on competition https://www.youtube.com/watch?v=DLWyP83iU5M http://www.bnjs.co/notes/cs183b-lecture-5-peter-thiel-busine...