You don't have a company yet if you're dependent on future investment.
In some cases this lack of maturity is particularly striking.
I think it's far to say you don't have a sustainable business model yet if you're dependent on future investment.
Even a company that is fully owned, with a sustainable and profitable business model, needs to ask the question "can I lose all this?" every day.
If the metric for "you don't have a real company" is you could potentially lose it, then nobody has a real company.