As Eliot Higgins, the founder of Bellingcat, says in this thread, it's disturbing that a completely insane conspiracy theory about Kate Middleton swapping her face in a photo has 38M views.

People who actually understand photo manipulation have debunked this repeatedly (see Eliot's thread), but it has no effect. The truth truly does not matter to people because they want to believe the conspiracy and cannot be convinced otherwise. https://twitter.com/EliotHiggins/status/1767315138221146553