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Was that an accident, or was it on purpose because centralized systems are easier to monitor/censor?

China does not have many public IPs (v4) in the first place, so I doubt it is in any way deliberate. See https://en.wikipedia.org/wiki/List_of_countries_by_IPv4_addr...:

Country | Number of IPv4 addresses Per Person

US | 4.91196

China | 0.24591

And IP addresses per internet-connected person?

Searching for 'China internet percentage' shows several sites claiming ~50%, so double the ratio to ~0.5, or 10 times less than the USA.

I don't know the numbers, but even if it exceeded one, it wouldn't mean every Chinese would get one public IP. Many IP addresses are still on sale.