Isn't one third for 10 years actually quite good success rate? I would have expected lower. 10 years is long time even for not failing new businesses. And not failing here means generated more than spend over lifetime.
They don’t. Why would they. Alot of them are just complete grifters and waiting for that big pay day in the sky after they get acquired by FAAAAAANNNNNGGGG or any number of the subsidiary’s. If your app claims to “revolutionise” something completely mundane and trivial like getting a shower or eating a sandwich and you value it at $5 billion then it’s a load of bollocks.