They are using fame and past success as a proxy. You would need to do it on the basis of your ideas and the work that you have done. Someone really knowledgable would need to dig deep on your work and then the VCs will need to trust these person(s). The other alternative might be to try to get traction with users like Linus did with git and hope that they like it enough that it becomes popular. But Linus had the advantage of being famous and highly respected already,