Okay, so I decided to come back to Sea of Thieves and download the game through the Microsoft App.
Part-way through the download I needed to pause and cancel and reinstall it later. However.. when I came back, the download INCREASED by 10gbs.
After letting it run its course, the download went up by 10gbs over and over again until I got to this point:
The game is just stuck in an infinite download but isn't actually downloading anything.

