If I did, I'd have already sold my Facebook and Twitter shares and sprinkle words of wisdom down upon the masses. Or become a VC.
But, if I'm a company looking for vendors, I evaluate "good" vs "bad" in the context of sustainability of the org. If they don't have a path to profitability and sustainability as a company, they're bad. If they do, they still may fail. But big companies fail too. I know no one gets fired for buying Oracle, but what are you missing if you ignore Postgres?
Postgres isn't a startup, it's open source software that you implement yourself. If the people currently supporting it decide to stop supporting it, then other people will (eventually) step in to fill the void. In the meantime you can keep on trucking with your working production code.
Rely on a startup and when it fails, the part of your business that relies on it fails with it.
But, if I'm a company looking for vendors, I evaluate "good" vs "bad" in the context of sustainability of the org. If they don't have a path to profitability and sustainability as a company, they're bad. If they do, they still may fail. But big companies fail too. I know no one gets fired for buying Oracle, but what are you missing if you ignore Postgres?