It's weird that this has to be explained to Americans - this is how much of Big Tech got to where they are, except they call it "disruption".
BTW this shows perfectly that free markets are not a be-all-end-all thing. It's a tool, and if it produces outcomes that you don't like, you can adjust it for better outcomes. The hypocrisy here is not that they pretend to worship the market then cry foul when China enters it on their terms, but that they do adjust it for their benefit all the time, and only pretend to worship it when people ask for their fair share.
DSA enforcement is spicy, since the EU can create its own team to fight disinfo on Twitter, and charge it to Musk, in addition to the massive fine.