No, the ban was lifted along time ago. But there are legal requirements that have to be met (official launching zones, transfers to and from these zones, special insurance, licensing and inspections, etc) that legal operators decided it was not in their best financial interest to pursue. Their profit margin was not great enough in Negril to make it worthwhile.

There are a few operators running elsewhere on the island, but in Negril, the operators decided it was best not to operate...

The private jetskis I saw during one particular weekend were brought by their owners from Kingston to use on their weekend getaway in Negril.