I'm usually not the overly paranoid one but shouldn't you assume that all Chinese labs are training on your data no matter what the T&C say?
I assume that all labs are training on any data they can get their hands on.
And American providers, not sure if it's still the case but OpenAI were doing this.
I assume that of all of them as a basic security precaution.
I would also assume the same for non-Chinese as well