I wouldn’t really be all that upset to see them banned but there’s no momentum for it. Crypto just happens to be really visible to a lot of people who see no personal benefit for its existence.
For sure, and in other contexts too, but I don’t think the issue of not being able to buy gas because cruise ships exist comes up often (mostly because AFAICT it’s not real). And that’s really my point: it’s perfectly valid to complain about cruise ships being wasteful without being able to point to some incredibly obvious consumer-facing manifestation of that waste, because them being wasteful (they are, obviously) isn’t predicated on any such manifestation. Despite the vast scale of their waste, they’re a drop in the bucket that is the global economy.
For all I know off the top of my head (where this comment is coming from), cruise ships aren't a significant driver of oil prices. I'd expect the scale of the shipping market to dwarf their effect, and I'd expect production to rise to meet their relatively steady demand, though I could be wrong about either or both. None of that (whatever the answers may be) means they aren't hideously wasteful in absolute and very meaningful terms.