You can almost guess someone's age from that alone - they're more rare, but long domain names still appear that encode a city and a state, and you could just "grab" the first part when signing up.

Github Pages is probably the most well known one (on here).

I think geocities had this as well?

A lot of hosting services offer this in general. (eg render)

Tumblr? (Might not count as the control over the page is more limited. The subdomains "are" still tumblr.)

For reddits subdomains are redirects to subreddits of the same name, so I guess that doesn't count.

I remember I had beach.santa-cruz.ca.us at one point registered to me. I owned beach.santa-cruz.ca.us, someone else owned santa-cruz.ca.us, yet someone else owned ca.us, and I believe Network Solutions took care of .us at the time.