People aren't going to KubeCon China because of being harassed by minders. This is not an isolated case. It is pervasive and it is chilling.
These are the people with the means to challenge the power structure, and they are watched more closely.
If someone in this wealth range holds up a blank piece of paper, they may end up in jail.
With any foreign country you should understand their cultural norms and laws. Your own ignorance is a valid consideration for travel, not being arrested as a political prisoner. You won't get in any trouble as a tourist or business person 99% of the time.
So there is 1% chance; and why would I take even 1% chance of getting into troubled country?