Not doubting they aren't spying on people, but regardless, how would you really know? Are you basing this on that no Chinese police has visited you, or how would you really know if it's "simply true" or not?
With that said, I use plenty of models coming out of China too with no fear, but I'm also using them locally, not cloud platforms.
Each model, the tooling you used and even what prompts you use for what model, impacts a lot of the quality of responses you get from the models.
Of course with Kimi there is fear because the Chinese government can easily pressure Moonshot AI into sharing the data, and other countries have to work to stealthily siphon data off without being caught by Chinese counterintelligence. As opposed to GPT5 where the American government can easily pressure OpenAI and every other country has to stealthily siphon data off without being caught by American counterintelligence. The only way to be reasonably certain that you aren't spied on is to run your own models or rent GPU time to run models.
The bigger worry imho is whether the models are booby-trapped to give poisoned answers when they detect certain queries or when they detect that you work for a competitor or enemy of China. But that has to be reasonably stealthy to work
They all must be doing a great favor to humanity in a good will then.
Sorry, but seriously -- Chinese government, controlled by the Chinese Communist Party (CCP), can effectively seize or shut down internet services and infrastructure at will within its borders under its national security laws.
No need to read the TOS; it's in the law.