Well, I don't think Bitcoin has no value . Why? Because if there is none why many people still into it. Many still gaining income from it. So meaning they valued Bitcoin.
They value bitcoin but bitcoin does not have any intrinsic value. This is a correct statement.
Just like the fiat money is just a piece of paper with some writing on it, it also has no value in it if you consider it as a piece of paper. Now people take it for granted that they have a certain denomination and thus a consensus of a value. Bitcoin is valuable because people support it and they have been buying it gradually leading to a price which is considerable against fiat money.
its the same with art its just some paint on a canvas and it can be worth alot of money, or it can be worthless, same with everything realy things are worth what people are willing to pay for them.