I think that some real people (public persons) are ready to see/hear that someone mocks them, and the rest is not ready for such attention. It’s interesting that our voices and appearances are not unique. I knew people who look or sound like me or like someone else, but when it becomes “and”, we read it as an indentity theft or something like that. We are not far from calls and records to be signed by personal identity keys and fingerprints included into id documents, because otherwise it would be hard to recognize who is who.