I think the real topic here is that most people are doing it for the money, not because they want to build a marginally better Twitter, Facebook, Youtube, etc..

I think the real topic here is that most people are doing it for the money, not because they want to build a marginally better Twitter, Facebook, Youtube, etc... You can use this do-it-yourself argument in every sector of the industry. But it all comes down to the amount of reward per effort. Do you want to be the first in a store on Black Friday or the last? Do you want to be the first in a gold rush or the last? As the amount of competitors increase, your profit will decrease. From an economic perspective, a monopoly is usually more lucrative. If you feel there's enough money in a crowded sector and think you can carve out a niche or shake the industry, then it becomes economically viable. I think this is a more realistic outtake than the author's "just-do-it" message.