This is like a basic SEO strategies if I'm not mistaken. You get your site listed and hope to be indexed by Google the soonest so that you can be listed on their platform and possible drive crazy traffic on your webistes. And then directory listing would also benefited by ads revenues as wll, win-win situation for crypto enthusiast. I wonder though the extension of the domain, why not go for the a .org or .io?
I didn't plan so much when I register the domain name. Just for fun since the site is not to charge the users anything. If Bitcoin people can contribute to the listing on where to spend Bitcoin. That would be a useful guide for travellers who wants to spend Bitcoins during their trip. They can just check the directory.