Capitalism is "freer" than chattel slavery and feudalism, but it's far from "pure freedom". Actually, "pure" freedom amounts to chaos, hence nothing can truly be
absolutely free and functional. It will break down. Even God has His boundaries.
Capitalism can function with a bit of socialism until advanced technology automates production to such an extent that it's no longer practical or efficient to hire human labor at a rate necessary to sustain the marketplace. Markets need paying consumers and under capitalism most paying consumers (94% of the population) sell their labor power to capitalists (6% of the population). That small group of capitalists owns the "means of production" (i.e. all of the land, facilities, machinery, vehicles, capital, credit..etc) and this arrangement will continue until intelligent robots begin to eliminate jobs (wage labor) to a point that it causes a serious economic crisis, along with a critical degree of social unrest.
These billionaires see the writing on the wall:
Do you think they're offering people a "UBI" i.e. Universal Basic Income, out of the goodness of their hearts? No. They're well aware of the inevitable cataclysmic outcome of advanced 21st-century, intelligent automation (catastrophic for capitalism not socialism). It amounts to society being forced by necessity to adopt a non-profit, marketless, moneyless, democratic, centrally managed, highly automated system of production. Another word for that is socialism. There's also another term that I could use, but I'll use the less scary one.
Advanced automation ensures that socialism will become the successor of capitalism. It's the natural "inheritor" of the capitalist estate.