#1 - The centralization of PoW mining will become more and more centralized over time, because big operations such as this will make the little guys unprofitable and therefore push them out of the market.
#2 - The huge amount of electricity that is wasted needlessly with PoW.
You've managed to fail twice in a row. Good job!
At least I'm not a fanboi that only cares about his special interests and can admit Bitcoin has flaws.