The difference is that each startup is unique. Each has a different business model, and each will succeed or fail based on the viability of that business model.

In contrast, everyone mining Bitcoin is working on the same thing. It's a commodity, and each miner is trading electricity + hardware for some amount of the same, interchangable, virtual item.

That means the valuable expended in order to create the good (Bitcoin) is more likely (through certainly not guaranteed) to be captured in the price of that good.