Israel is committing a genocide in occupied Palestine. So Yemen is intervening by blockading Israel through the Red Sea and launching strikes (similar to the NATO intervention in the Kosovo genocide).
Shipping companies, rather than abiding by the selective blockade of Israeli bound ships, are re-routing all ships instead because they believe making this a global problem will resolve the matter with military intervention without them having to "pick" a side. Some of these companies also have deep ties to Israel (or based in countries that have de-facto signed off on Israeli aggression) so abiding by the blockade is not politically feasible. One exception is COSCO and they seem to going through the canal just fine.