I think this mostly has to do with barriers to entry. 15 years ago it was orders of magnitude more difficult to launch a business online than it is today so the

I think this mostly has to do with barriers to entry. 15 years ago it was orders of magnitude more difficult to launch a business online than it is today so there was far less competition. But it's important to remember that it was much more difficult. If you look at it that way, there are always emerging areas that have little competition because they are so difficult. So if you had the ability to and were smart enough to create an innovative product in your basement, I think you absolutely could grow it into a behemoth. Starting a computer company today would be very difficult and costly. Starting a computer company at a time very few people understood them or knew how to build them would be a lot more feasible if you were an expert (Woz). Companies get disrupted by companies that are almost by definition starting in a seemingly completely different area.