You can do that for the odd small tool, but you can't launch GreatNewThing™ without having it's own full domain!

Except it never gets any users.

I suppose the plus side to spending months rather than days on projects that never go anywhere is I have fewer domains. Only 7 here. Sigh.

PuTTY is hosted from a user home directory[0]. Maybe having a fancy URL isn’t everything.

[0] https://www.chiark.greenend.org.uk/~sgtatham/putty/

I like to remind myself that Wordle, when it went crazy viral, had a domain that was very unmemorable

https://www.powerlanguage.co.uk/wordle/

Not having the "right" domain is never the blocker