I am the first “technical” hire of a startup. I think my contribution to both business capabilities and building the product is significant, maybe as much as a co-founder, but I would never call myself a founder. I founded an other company in the past that I kept running for 9 years, and I can tell the emotional and caring is very different regardless your impact and effort, even if it is 24/7. It is feel like being a stepfather. Maybe the best one, behaving and treated like a real one, but still…

IMO, no.