Theyre gonna pay for it over the course of a decade. Meta revenue is still increasing 10% every year, a $50 billion lease payment on datacenters that are only worth $10 billion is annoying but they can handle it. Also this isnt actually debt, there is no interest. Its commitments theyve made to lease datacenters. A lot of the money here is a $10 billion dollar payment they owe a decade from now.