My understanding is that the Chinese government prefers to have multiple successful companies in each field and they don't like it when one company becomes too powerful.
They pivoted away from that quite a while ago now they just disappear people for a week or two and randomly completely crush a business here and there to make sure they understand their place.
So also does the US. Trump had prominent cases against Google and Meta. Biden against Apple and Amazon. Prominent efforts on airlines and grocery stores. Honestly, I'm pretty sure the US and Chinese antitrust laws are pretty similar (theirs largely crafted after ours).