For a brief, golden period, startups were new and innovative. You could stand out from the crowd by taking some risk and working hard. Early YC reflected this ethos.

Now, “startups” are so common as to trigger cynicism, and merely starting a company no longer offers differentiation. Every angle that can be explored is being explored, usually by multiple scrappy, identically hustling teams of millenials, and to differentiate, you need to take risks that feel increasingly long-shot to stand out (e.g. nuclear fusion! electric planes! revolutionizing drug discovery!) Even the seed-stage “accelerators” are systematized, large-scale success-mining machines for fairly well-developed companies.

Which is not to say that there won’t be successes; there will almost certainly be “unicorns” from 2019, as there have been in just about every year. But the frontier is closed, the game is clear, and it’s the same as it ever was.