Question : I wonder why the hull insurance business is always done under marine insurance category?
Is it just because of the similarity of the risks or there are other reasons?
marine insurance

Best answer:

Answer by mbrcatz17
“Marine” coverage is mobile coverage. There is inland marine, for stuff on land, including but not limited to cargo and mobile equipment, and ocean marine, for stuff moving on water.

Hulls are mobile. It’s not the “water” implication of the word marine that makes it appropriate there, it’s the “mobile” implication. Although the water doesn’t hurt.