A share of equity is a fraction of something substantial in the real world.
This one is more like a commodity---but one intentionally designed to have no physical-world significance, but be very easily
Nobody has discussed the true reason why bitcoins aren't remotely useful as money. There's no bond market. That's what actually makes for useful money in the economic system and is the purpose of money---not just being a facilitation of bartering item X for item Y but for bartering time. The real-world modern uses of money all center around loans.
When you can get a mortgage in bitcoins then it has become money.
But it won't happen, because people can get income in bitcoins.
Another flaw. Now, the global limitation of bitcoins means that they will inevitably be deflationary. If the dynamics are deflationary then people prefer not to give away bitcoins---but the purpose of money is not to be hoarded but to be used. So the deflationary dynamics result in a contracting money supply which is a sign of economic collapse---and fortunately there is no significant economy attached to bitcoins, and there shouldn't ever be.
Bitcoins are the geek form of hawala.