If you think there was no rational reason for the “crackdown” on those sectors then you aren’t following China’s economy in much detail. Those sectors were becoming “successful” in the way Wall Street and the American housing industry were “successful” right before the 2008 Financial Crisis.Well I agree with you that there is no rational reason for the crackdown. But recently China has been cracking down on any sector of the economy that starts to become successful with little or no reason at all. Regardless of monopolies, and including those that are important for national security and survival, etc. Which is why China's GDP growth has now slowed down massively. By the way, monopolies like google, microsoft and apple all operate in China too yet because they are US tech, China has not cracked down on them. They only crackdown on successful Chinese companies, not US ones. The same is true for the US govt. Which is why I say both governments are in a pact to suppress Chinese success in tech.
The current GDP slowdown is one part zero Covid and one part real estate correction. The real estate correction was a *long* time coming, since that was the part of the economy that was driving debt faster than growth in the economy.
In general we don’t say cancer is good because it’s good at growing. The same is true sometimes for certain kinds of economic activity.