Your logic assumes that young founders/developers are very proficient in many languages (including lisp) and they have perfect information for choosing. In reality, they use whatever crap they picked up hacking in high school. On top of that, the tools are only a part of the ingredients. However bad your platform is, at least it works, while most of the screw-up is hidden in business decisions - that's why every startup incubator's job is to help the youngsters not screw up business-wise. Tech is normally something up to the founders, most of whom have never heard of lisp.