Ironically, it seems Carnival have switched at least some of their ships to use starlink [0]. I can't find a date on that webpage, but assume it happened after the confiscation of the customer's starlink mini.
Speed comparison (screenshots at 2m53s) shows Carnival's wifi at 3.88 mbps download (upload not shown) Vs starlink's at around 140 mbps down and 30 mbps up.
Also (4m55s):
> unlike every other Cruise Line they intentionally blocked the port for Wi-Fi calling. The only way I was able to make a Wi-Fi call was on my satellite dish
[0] https://www.starlink.com/kr/business/case-studies/cruise
Also (4m55s):
> unlike every other Cruise Line they intentionally blocked the port for Wi-Fi calling. The only way I was able to make a Wi-Fi call was on my satellite dish