Their prompts would differ, depending on their use case. For ChatGPT, even a few words can effect a huge change in the personality it shows.
> Are there any others?
Both scenarios are vague enough for lots of uncertainty. If many AIs are around, perhaps they would see each other as bigger threats and ignore mankind. And different optimizing tasks might conflict with each other. There could be a paperclip recycler for every paperclip maker.