Earlier quoted context omitted.
> Have the workers own the robots I am pretty sure that workers are free to buy publically traded stock. I also would probably not invest if I were in their position.
That was Karl Marx's whole solution. Make the workers own the factories. We have a better way of socializing wealth. It's called the public stock market. Workers can buy shares of any corporation on it, not just their own, and they are protected by regulations. Having said that, I think that we should tax the machines. We are building a cage for ourselves with machines empowering organizations to monitor and control…
This is a good idea in theory, and indeed I've often wondered why unions don't actively invest in the market and use their voting rights to ensure themselves a seat on the board - but my radical idea about the future of unions is another topic.
The problems with the stock market approach are twofold. First, if workers are not paid very much then the extra income they derive from stock ownership, even in the aggregate, is unlikely to make them competitive with existing forces of capital, unless the labor force owns 50% of the company, and even then individual workers are easier to buy out. Second, everyone in the markets faces a principal-agent problem where management involved in the day-to-day running of the company exerts far more power than shareholders because management can shape how shareholders perceive the company and which information they receive, such that it is very easy for managers to get shareholders to do what they want. Sometimes managers go overboard and become subject to criminal charges when they are too blatantly corrupt. In the US that just gets fines and maybe a short stint in jail; in China people can be given the death sentence for corruption, and yet it still occurs, notwithstanding the ongoing anti-corruption campaigns of Xi Jinping's administration.
My point here is not about China in particular, but to suggest that the mere existence of capital markets is by itself insufficient to make capitalist structures responsive to the public interest.