Regular internet on ships is a flat rate for the ship owner (except for Inmarsat, which is hugely expensive and only used if nothing else works) and the big issue is sharing limited bandwidth with all users. Before Starlink this meant blocking all streaming for our ≈35 people crew, unless you used a VPN, which allowed you to bypass blockage and would get you banned if caught. It's a huge cat and mouse game that burned too much of my time. But then, cruise companies are sleazy as fuck and totally deserve this.

Source: I was a radio operator on Greenpeace ships for nearly 20 years