Your side point about it supposedly being an anti-trust violation isn't even a proper answer to the question.
The point was that unless you already have a money printing business in another area that you can use to chase this for years without budgetary constraints, it would be very difficult to build something of a similar scale. I think you are arguing a point that my post largely already agrees with.
Any company has an edge on any non existent company, because they exist - they have the tools, the infrastructure, the knowledge needed to run the business, all things that the non existent company first has to aquire. Doesn't explain why nobody else can do it! Because things, in general, can be aquired. But clarity did: Youtube has Google. Youtube was able to aquire things nobody else could.
Example: You said youtube needs near unlimited bandwidth. This argument doesn't show me why there can't be a competitor. Youtube's business model seems to pay off, so you should be able to convince an investor to pay you, too, unlimited bandwidth, right? Money is immaterial if you can show that you can make more of it at a later stage.
