Some licenses allow anyone to create derivative works that build on the original product, while others reserve that right only for the owners of the original product.
Its pretty clear they're referring to the ability to make commercial works, not downstream OS projects.
Those biases seem to arise from an outdated view of the market for open source software. Students of history know that pioneers of new markets are able to command profit margins approaching 100 percent as long as they can behave as monopolists. As their markets becomes subject to fair competition, margins fall. Expecting 90 percent margins is probably not realistic, yet the authors clearly do:
He seems to be ignoring his own point from the next paragraph, most VC ventures fail. In order for them to see high returns they need the huge home run, if a business bunts into first and barely covers the investment they're still in the hole for the other 5 ventures that failed
Sure for random Joe's website it would be difficult. However why is it any different than circulation numbers for print ads?
It is much harder to find a job than to keep one.