I've traveled on Royal Caribbean and Carnival. Neither checked luggage routinely.
I unfortunately booked on a cruise line that explicitly said they do not allow drones on board.
However, checking with Princess Cruise Line they do allow drones to be brought on board, but prohibit their use on the ship or in the port.
I suppose it depends on which cruise line and where you're travelling to. For example, the only time I'm
ever asked to take my shoes off and pull the belt out of my pants loops before stepping through an airport scanner is when I'm flying to the USA. Only Americans have this strange fetish with shoes and belts.
Way back in 2013 I brought my original Phantom-1 with us on an Adriatic cruise on Celebrity Cruise Lines sailing out of Venice. Back then, drones were still a relative novelty. But even way back then Celebrity ran all carry-on bags through an X-ray machine.
"Please open that case for us. What the heck is that thing?", they asked. It's a radio-controlled multi-rotor helicopter that carries a GoPro camera for making aerial videos. "No way! That's so cool! How much does it cost, how far/fast can it fly, and where I can get one..." Back then everybody was intrigued, and I never received any grief from anyone. But even back then the security guys said it was okay to bring it onboard, but I better not try flying that thing from the ship.
In Kotor I flew it out from the shore to get some shots of the ship. The security scanners are right inside those doors where the orange tenders unload passengers as they're ferried back to the ship. When we got back later the security guys said they had seen the drone flying. "That's so cool!"
Kotor was also the scene of (one of) my most regrettable droning failure(s). The Phantom was quite heavy, and required a lot of other accessories. I schlepped all that gear around in a hard case where ever we went, plus carried a tripod on which to mount my video monitor.
We hiked (carrying all that stuff) halfway up to the old fortress that sits at the top of the cliff overlooking the walled city, with the intention of flying the drone from there. The view was spectacular with the modern cruise ship in the harbour in stark contrast to the ancient walled city below. And just as I was taking off, the bell in the nearby chapel tower started ringing as I flew the drone around it. It was awesome!
Unfortunately, out of breath from our climb and in a hurry to get set up and go flying, when I pressed the buttons on the GoPro to start the video recording I accidentally pressed it twice, switching the GoPro from video mode to camera. So when I pressed the shutter button to start the camera recording, it only snapped one photo of my crotch!
D'oh!
Anyway, here's the video: