Because access to capital matters. If you are a non-VC funded business, you need to generate a profit. How do you compete when a VC-funded business comes in and starts selling a competing product at a loss?
I invite the folks downvoting to explain how capitalism works with a market monopoly. Since pointing out government exists to prevent just such a situation is apparently an unpopular opinion.
However post-2008 world is one where (1) the government will probably step in and rescue the people who were lending the money and (2) there are lunatic low-interest policies that encourage lending to anyone with a pulse over all forms of sane weighing up of risk.
So why not fund businesses that burn money? The problem in the story isn't antitrust, it is low interest rate policies that excessively favour borrow-and-spend tactics.