The Bab-el-Mandeb has tons of ships in it, and as far as I know the only ones Ansar Allah have attacked are the ones who have ignored their very clear criteria.
It’s incredible to watch in near-real-time how hollowed out the US’s ability to project its will has become. They announced Operation Prosperity Guardian, and within days it seemed to collapse. Looks like there aren’t many folks signing up to be vassal states these days.