Not every time. Those mentioned were mostly the exceptions.
Tons of people were on the show not as themselves.
Daniel Radcliffe wasn’t himself or Harry Potter on the show. He played a character that was a parody of Twilight. It had a somewhat decent enough joke and wasn’t just hey look at this famous person we got. Look how cool they are. Ooohhhhh ahhhhhhh
Pretty sure they used their real names…
Not every time. Those mentioned were mostly the exceptions. Tons of people were on the show not as themselves. Daniel Radcliffe wasn’t himself or Harry Potter on the show. He played a character that was a parody of Twilight. It had a somewhat decent enough joke and wasn’t just hey look at this famous person we got. Look how cool they are. Ooohhhhh ahhhhhhh
It does depend on how they are written into the show. Leonard Nimoy in the Monorsil episode is a caricature of himself and it works well.