Yea, and why not just look at the actual history of FB where they were quite easily able to pay for server costs at an early point with ads. It's possible they hit a point where they were losing money, but 100% at any point past the very beginning if they wanted they could've invested less and been a profitable business. Possibly not a business that would've existed for the long run and it might have opened the door for a competitor, but they could have drawn down money out of the business they had built. Many of the companies people complain about actually couldn't do that because they don't have any ability to raise their prices without losing all of their customers.