Of course not. They've been creating new societal, political and economic problems instead. It's a problem that more energy is wasted on fantasy gold than some decently sized countries. It's certainly messed with GPU sales and creates more e-waste as parts are pushed to the limit 24/7 and need to be replaced more often than they were originally designed. And now companies like GitHub have to deal with scammers trying to abuse free services to mine crypto and consumers have to watch out that the free app they downloaded won't mine crypto in the background using their power and hardware to do it.