"One to n" Vs "Zero to one"
Going from one to n is just a start of another new business which is already existing in the market. You are building something which is not unique, which is not something people can say 'okay this is something new in the market'.Its just another service from another brand.
Going from zero to one is a process where you have unique idea which was never build, never used. You make something new that gives value to people.You start something which can overcome some large and real world problems.