The whole point of Sea of Thieves: A Pirates Life was that it served as a crossover event between Rare’s pirate game and Disney’s Pirates of the Caribbean series. But tucked away at the end of the expansion is a secret that has nothing to do with Captain Jack Sparrow, or really Sea of Thieves for that matter.
Source: Kotaku – Sea of Thieves: A Pirate’s Life Has A Very Fun Easter Egg