Except that the examples I gave fly directly in the face of the situation you're stating. Amazon replaced Walmart with exponentially less starting cash. Netflix did the same to the entire media industry.

Venture capital and business loans could easily fund the next big industry giant provided the barriers to entry aren't astronomical. But corporations are utilizing their lobbying powers to capture the relevant regulatory market in ways that protect their interests.

Your problem is with corporatism and cronyism, whether you realize it or not.