Because if you spend enough time on the internet, especially the Western side, you start to hear voices of people who oppose their governments and not enough from those who support it.
Even many who are supportive tend to say that their government is authoritarian.
These countries don't get polled much, so it's hard to get a number. There's that famous Harvard survey showing extremely high satisfaction with the Chinese government though. Opinions on these countries are going to lean negative within the western internet ecosystem. For example, the vast majority of Chinese people are posting on Weibo, Douyin, Xiaohongshu, etc. etc. rather than Twitter, Reddit, Youtube, and Facebook.
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