It's an exclusive tourist destination and one of the most pristine places on the planet. It's the last place you would expect to find birds with bellies so full of plastic that they crunch if you squeeze them.
Unless you eat colourful bits of plastic thinking they're fishes or bugs, you're unlikely to be swallowing bottlecaps and whatnot, but tiny bits of plastic shed off plastic food packaging into food constantly, so we are still getting a lot of microplastics in our diet.
"On average, global human consumption is estimated at 0.1–5 g of microplastics weekly, equivalent to the weight of a credit card (Senathirajah et al., 2021)."