[0] https://www.mdpi.com/2076-3298/7/10/73/htm indicates that a lot of the coastal debris is plastic bags, while a lot of the offshore debris is fishing nets
https://www.youtube.com/watch?v=yYMuh-5V9fk
Portions of that garbage will eventually make it to an ocean. Especially plastics due to the simple fact that it floats.
[0] https://www.mdpi.com/2076-3298/7/10/73/htm indicates that a lot of the coastal debris is plastic bags, while a lot of the offshore debris is fishing nets