I had the same thought. For us, gratuities are included in the price we pay for our cruise regardless of region. I did notice the small print on our invoice states that "A service charge for dining and your stateroom attendant are included in your cruise fare. A service charge for additional onboard services purchased will be incurred and reflect on your Onboard Expense Account." My view is that we've already paid for the speciality dining in our cruise fair. It's therefore not an additional onboard service, so no service charge. I am however not a lawyer😉 From memory your next cruise will be before ours. Might fall to you to let us know on CC🤔