Although there’s already plenty of websites whose links upon addition to MB entities get cleanup up to a bare-bones canonical form (Discogs or Apple Music being some that I most often encounter - https://www.discogs.com/artist/69866-ABBA > https://www.discogs.com/artist/69866 - titles or names are removed, leaving you only with the entity type and ID#), some recent edits of mine made me realize that this automatic URL cleanup can be further extended to external links to many other websites too.
All are URLs that already contain the permanent numerical or string IDs of entities (artists, labels, releases, etc.) on said websites. Even if you remove all superfluous elements or replace them with one or more placeholder characters, the resulting link can still get you to the desired page.
setlist.fm
The [name] on:
https://www.setlist.fm/setlists/[name]-[alphanumeric-id].html
can be replaced with wd.
Example: Edit #115617969 where I changed tori-amos-13d6b9e9.html to wd-13d6b9e9.html
Qobuz
I noticed that there’s - and _ that work as replacements for names on artist (or interpreter as called on URLs) and album links respectively. You can see my edits #115442141 and #115633898 as examples for each respectively.
Beatport
Similar to aforementioned Qobuz, names and titles can be replaced with a single character, namely - and _. Unlike Qobuz however, both characters can be interchangeably used on links to artist pages as well as releases.
For example, on Edit #115535563 I shortened the link to Beatport release by replacing the title with hyphen-minus, although underscore works too:
Same case with artist pages on my Edit #115443033.
If you change the underscore with hyphen-minus the link still works:
Cast Albums
Links to artist pages can be simplified by replacing the artist name with underscore, see Edit #115617968.
There might be more websites whose links can use a similar clean-up (that I may have forgotten of), these were just at the top of my editing history.