To be blunt, you don't seem to have founded a company. If you had, you would know that some businesses just take some time to become profitable. And that's not just Internet-based business, look at Tesla or SpaceX for example.
What you say is true, but it doesn't rebut the parent's point: for the employee, it's not worth it
I agree. I was not trying to defend jobs at startups. We're hiring but can't afford high salaries so I totally understand that such jobs are no good for most people : not well paid, you lose it if the company fails, long hours, stressful. There are good points too (I wouldn't be doing it otherwise!).
So what? Employer's problems like that shouldn't matter to the employees. As your employee, my duty is to care what's in it for me (more precisely, my family that I have to feed), not what's in it for you.