Only a very lazy bad actor would try to use ChatGPT to generate propaganda (and admittedly, there's probably quite a few people who will get caught trying to do

Only a very lazy bad actor would try to use ChatGPT to generate propaganda (and admittedly, there's probably quite a few people who will get caught trying to do this). Anybody who's even slightly sophisticated will use a local LLM, which isn't something that you can guard against.