People are so desperate to find viable business ideas. We discuss to death MVPs, fake landing pages, articles describing how to find and validate ideas and find first customers. Yet, no one notices when business opportunity stares them in the face. Go and duplicate screenhero. It's not that hard (Screenhero was written by 4 devs and 1 designer). They did YC in winter 2013 and got acquired by Slack in Jan 20015, so it…
Yet Screenhero had been at it for 4 years at least, presumably had ongoing guidance from and access to the great business minds at YC and yet in the end decided that the best value they could get for their product was as a feature of Slack.
They made a useful app and probably would have at least a multi-million dollar business, eventually.
As it happens, that was worth much more to Slack so they probably got a good immediate payday and stock in very promising company.
For 2 years of work, I would say that's a great success.