Facebook doesn´t have enough money? They want to earn money in an industry they don't understand. This can only result in a damage of cryptocurrencies or in a damage Facebook as a company. 
Of course they have enough money and more than enough,,, but you know how the rich become rich? They keep wanting more money. And who would not? Everyone sees Bitcoin and they see that it is an amazing creation. They think if you cannot beat them, why not join them? Why else do you think 99% of projects are centralized and half of that is all about corporations getting into "the game"?