Stiglitz is in favour the government printing money as a solution to many economic problems. What he must be concerned about is that if bitcoin is the medium of exchange, that lever no longer exists. Monteary inflation controlled by public servants or politicians is no longer a thing in management of an economy.

I'm making no comment about whether he's right, or whether bitcoin is good, bad or indifferent. This is what needs to be considered about Stiglitz's position and it's worth discussing, with him as well as other economists.