It’s possible if you already have a domain. Just need to add a tracker (just a small HTML file) so it can be read by their crawlers and recognize the domain to allow the change UwU). That said, even I want a custom domain

I do have one, and use my custom domain (same as my carrd) as a handle, here! I'm mostly referring to a way to semi-automate the process for people who might want a subdomain under, for example, "nasilemak.love" (this is a hypothetical example) 😆