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I always thought they exist because privacy. Regular old DNS requests are not encrypted so even if you send a request to 9.9.9.9 your ISP can still see it.
Never had an ISP firewall my DNS. Not sure what country you live in, but it sounds like China at that rate.
It’s usually ISP specific.
Some ISPs in the USA and Germany have been doing it. This is why DNS over HTTPs exists to bypass those blocks.
I always thought they exist because privacy. Regular old DNS requests are not encrypted so even if you send a request to 9.9.9.9 your ISP can still see it.