Yes, I've played poker on a cruise ship, but it wasn't Royal Caribbean. It was on the "one ship cruise line", Regal, and it was about 8 years ago. They are still sailing out of Ft. Lauderdale, but it's only to the Bahamas and back. Don't know if they still have poker.
Serenade of the Seas b2b January 2016
Serenade of the Seas b2b January 2017