Currently there is little concentration compared to what it would be, without copyright you would have a single big corporation where people get all their content. You either get paid by them to create content or they distribute your content anyway without paying you. Under such a system no way youtube would pay creators 55% of revenue and so on, big corporations gains way more power when you remove copyright.

That wasn't much of a problem before copying was so cheap and easy, but today that would absolutely happen.