Btw. you can also book a ship travel on freight ships. Don't ask me about the comfort though (most likely empty crew cabins) and it definitely is not cheap either. They take nearly hotel prices (at least that one time I looked into that).
This is fascinating to me. Please share if you have more details. I cannot imagine it being a thing in the litigious US.
I have done this. Liverpool to Philadelphia in 10 days. Narrowly selected over Le Havre to South Carolina or some such.
Pros:
You can say you did it
Big rooms
Crew very excited to have you onboard
The deep ocean looks different than the near/shallow ocean, especially in a storm, in a way that awe struck landlubber me
Cons:
Shower seemed to have no U-bend
Expensive
It takes 10 days
Nothing to do for 10 days
Fairly seasick for 10 days so the above point didn't matter much
Cutlery and others slide off table in big waves
Immigration officials very suspicious of young people arriving this way
Others:
We were a little late because we sheltered behind an island for a while as a storm went past
You eat meals prepared by the ship cook for the crew
I recall we could have walked around the bridge any time. Crew is glad for something different and the water views are good (looks like water anyway).
Crew likely speak English and pretty good chance are Philippino