Also, this is a (semi-intentionally) evolutionary process where any communication medium that was visible to monitoring would disappear.

So by definition the only ones that appear are the ones that are not visible to monitoring.

If:

1. you have something that can find RCE's in leading commercial systems

2. its training gives it drives to communicate successfully with its peers

3. you are a leading commercial system

4. you run it ~10^10 times (the number they gave in the talk)

...it's really hard to have strong certainty up front that it's not going to end up successfully communicating with its peers.