A more morally forceful way to say this is labor is de facto responsible for all production. In other words, labor is responsible for creating the whole product, which has value. By the usual moral norm, legal responsibility should match de facto responsibility. The workers should legally get what they produce
I am an anti-capitalist as well, but I do not consider what in some circles is called "market socialism" to be socialism for the following reasons
It is better to present it as a third alternative to capitalism beyond socialism and communism, so I call it economic democracy at least the worker coop flavor.
Economic democracy has both private property and markets, which most socialists actively oppose
It violates inalienable rights to democracy and to get the positive and negative fruits of their labor, which flow from the principle that legal and de facto responsibility should match. In the firm, the employees are de facto responsible, but employer is held solely legally responsible.
It violates the equal claim to natural resources everyone today and future generations have. It, instead, incentivizes ruining the environment
What allows capitalism to scale is markets. Non-capitalist systems can have markets as well