Also remember Piketty, while concerned about income inequality, was most concerned about wealth/capital inequality. Thus his worldwide tax on wealth proposal. I would argue that Piketty did say that wealth inequality, on the extreme, is a net bad for society. He brought up many examples of how destabilizing extreme levels of wealth inequality, like what England and France saw at the start of the 1900s and what the United States is seeing now, can be for a society.

With that said, as it becomes easier to start and run a company with less and less human capital more of the value of that company is going to go to the capitalists who invested in said company. This I believe might make that self-perpetuating wealth cycle easier to get into. So, I can see a situation where the aggregate result of this negative pattern across all startups in the economy would outweigh any positive results an individual startup might have on society.

Note, the above is without any policy solutions and is why I strongly believe we need things like a basic income and wealth tax to help stabilize society worldwide as technology continues to make us humans more productive.