You haven't seen the videos maybe? People spitting in masks (in China, purportedly) and doorknobs and elevator (in Europe, purportedly). Not a proof and not directly related but I wouldn't put it past China. It shocks me when they claim they have 0 new corona virus cases. If they're lying about something as basic as this, what else are they lying about.

It's a meaningless thing to debate. To the extent coercion comes in to play, trust breaks down, so you can never know what's really going on. That's why bullies lose in the long run, but probably so does everyone.

Or China rubbing their feet on masks before packing them.

Negligence is more likely than malice, but the result is the same either way -- what good are masks that don't work?