It’s not only about the pollution: Cruise ships are also bad for cities as cities. A cruise ship will vomit 5000 people into your city center. Most european city centers are quite small, so 2-3 cruise ships will totally overcrowd the city. People might buy some tourist shit, but they will get their breakfast & dinner on the cruise ship. That’s bad for local restaurants. They will not stay overnight, which is bad for local businesses, hotels etc. And they will push out other tourist, because who wants to stay in Dubrovnik when the experience is like this?
It really does make sense for cities to ban cruise ships and advocate other types of tourism, where the tourists are “doing” more for the local economy.
The fediverse offers a noncommercial alternative and that can be a draw. A “normal” Reddit user might not want to join us, but there will be users fed up with all the ads on Reddit, some of Reddits policies, tolerance of nazis and abuse and so on. Mastodon always was in the shadow of Twitter, a nice, but blew up when Musk started to destroy it. It offered a way out and that is worthwhile. And if Zuckerberg is starting to transform Instagram into a rightwing horror show, Pixelfed is there as an alternative. And if you want out of YouTube, PeerTube is working and ready for you.