Why is the coalition against the Houthis in the Red Sea led by just four countries?

The famous maritime coalition announced in the Red Sea by the USA, with 44 nations, in fact brings together only a few American, British, French and Italian ships.

The long-term consequences on world trade could be quite significant, and affect all countries, so why aren't the others taking part?
Why is the coalition against the Houthis in the Red Sea led by just four countries?
Why is the coalition against the Houthis in the Red Sea led by just four countries?
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