Keep up the good work and seize everything they can, chain it up at a dock somewhere and let it rot.how many of those yachts have been seized now ? I bet it slows down once the captors get a quote from the local yard and learn what the operations / maintenance / crew needs etc actually cost
Its not a 'yacht' it's more like 'gift that keeps on taking'. a massive liability
That's the only thing they need to do.