Well the part that excites me is that Ghost is one of the biggest newer CMS's started after Wordpress. Ghost is also open source so at least the work they do can be reused into the future (unlike say Threads or Flipboard) and we will suddenly have the ability of a lot of large parts of the web to be able to switch on federation without much effort. Look at all these large entities that use Ghost. Everytime one of these big players joins the fediverse there is this overflow effect onto little community players who might have chosen to use Ghost or WordPress or Flarum etc a long time ago and suddenly without the individual sites having to do much they can grow a whole new audience. So in short, I don't use Ghost and am not personally super excited by the project, but I am excited to see who it ends up bringing in!