site prefix? example
Twitch no
Twitter no
Github no
TikTok yes, @
Instagram no
Facebook no
GitLab no
Reddit yes, /u/
Steam yes, /id/ or /profiles/,
HN yes, /user?id=
YouTube yes, @
SoundCloud no
Bandcamp yes, w/ own subdomain
Pinterest no
Dribbble no
Figma yes, @
Mastodon yes, @
Bluesky yes, /profile

An even split – seems like newer sites prefer the prefix which saves a lot of headache.