Does DNSSEC have no effect on preventing DNS hijacking?

After opening DNSSEC, the domain name is still contaminated by DNS, DNSSEC has no effect?
Is it because the protection is not in place?I hope you can give me some advice. Thank you

What steps are you following to reproduce the said issue?

The domain name is registered in Namesilo, and then DNSSEC protection is enabled in Clouflare, which also passes the verification check 【DNSSEC check https://dnsviz.net/】.However, not too long ago, the domain name in the mainland was still contaminated by DNS (China can not normally access the web page)

Not all DNS resolvers are DNSSEC validating. And nation state actors can block outbound requests at a number of levels beyond just DNS.

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