I was always a bit uncertain about the vanity URL concept.
I already own several domains, so it is not like I actually need it.
I do have a weakness for self-hosting, though, so an actual home on the web where I can stash all my services under subdomains - that makes sense. Also, this is an experiment with Grav, which has a lot of interesting features and plugins. Experiments ahead. I have been adjusting the theme - some surprising defaults in there .