Oh I took it very seriously because it's something I've given quite a lot of thought. I'm not a huge believer in cryptocurrencies but I would be a lot more optimistic about them if they weren't wasting so much energy. Harnessing all that processing power to do something useful would be amazing. Unfortunately so far the most useful PoW people have manage to implement are things like "compute very large prime numbers" which I suppose is mildly more useful than finding SHA256 collisions but not by a very large margin.