Weren't Jolla (Sailfish OS), Canonical (Ubuntu Touch), HP/LG (webOS), Mozilla (Firefox OS), Samsung (Tizen) recognized companies? Yet they failed to break the duopoly. Even Facebook failed with their phone. Who would fight with Andoid/iOS then?
A person can dream.
Created a hobby OS, just a hobby, won't be big
They are all impressive tech, but not actual stuff you can sell or distribute until you can answer those questions.