[biot]

You appear to not know what spec work is. For bootstrapping to be spec work, there would have to be (for example) 20 different entrepreneurs who attempt to bootstrap a business according to specifications that a third party dictates to them. They pour in their blood, sweat, and tears to build the business by those specifications and at the end of it the third party chooses only 1 of them. The other 19 are contractually obligated to throw their business in the garbage and will have wasted their time and effort simply because they weren't chosen.

Same thing for building iOS apps. Want an iOS app designed on spec? Get in touch with a few dozen developers, all of whom build the exact same app using your specifications. Pick only 1 of them as the winner and the losers are contractually required to throw their app away.