Security is not usually the main use case of a service, but a necessary feature of one. Bitcoin can do many things, and its main use case right now is store of

Security is not usually the main use case of a service, but a necessary feature of one. Bitcoin can do many things, and its main use case right now is store of wealth, so with your examples you've demonstrated you don't understand its most basic function. When you notice that multi billion dollar transactions of Bitcoin are made every blue moon you might not be scoffing at what its security protocol is providing it.