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Some of this might fall under Ridiculously Human Robots for the broad scope of "Why are the robots speaking English to each other face-to-face instead of communicating near-instantly via Bluetooth?"
I must admit I'm a bit confused by what the question is, since it seems to be referring to highly intelligent AI, but also so dim that the two ad-bots in example 4 get stuck a pointless loop.
The idea I'm looking for isn't that the A.I.s are intelligent, but that they're mimicking humans perfectly, either to trick or entertain them. But that also means they'll waste power by staying Undercover When Alone, just in case some human happens to be watching them. So, a robot pretending to be a human selling something would have to say "in character" and try and sell it to other robots, otherwise, the human might realize something's wrong.
But, yeah, most of that seems to be covered by Ridiculously Human Robots.
Edited by Mac_R

There's this sophisticated notion in some stories where, despite having no real conscience, robots (or other type of artificial thing, like virtual world A.I.s and so on) who are supposed to act human, will continue to do so, even when there are no humans around to witness and interact with them.
Usually, one would assume that, if there's no reason for them to pretend to be human, they'll stop doing so the moment there are no humans around, if only to save energy. But no. Justifications for that are based on verisimilitude: