It think body doubles nowadays are in quite a predicament because of media. They can get a good sense of what is going on and form their own theories and may come to not like the people they are working for, especially the person they are pretending to be.
I think it was a lot different for say, Louis the 14th’s body double. That person was problem kept from knowing a lot of the intrigue that was going on and was happy to read from a script and wave from a carriage or balcony and eat pheasant and kumquats.
Meant probably, not problem.
I always figured a body double would be used strictly for people who are always in danger of being assassinated or kidnapped or by people who want to be in two places at once-and establish an alibi for whatever reason.
I suppose a bunch of them could be doing both...