> Or you could do the same with a data centre or supercomputer that runs useful services, like hosting websites or doing research (in fact there are already pro

> Or you could do the same with a data centre or supercomputer that runs useful services, like hosting websites or doing research (in fact there are already projects to use heat from servers for district heating). That depends on your definition of "useful". It looks like you don't think bitcoin adds value, but I'm pretty sure many people think the opposite and as such bitcoin is useul.