Similarly to MBS-14404, Google now has its own URL sharing mechanism/shortener.

Some example URLs found in edits:

• https://share.google/X8vYgCk4319KVxu4H
• https://share.google/Ggwr8IL5hOH1WQtwq
• https://share.google/pzNAn9YppC7IaQWzs

Here is an edit search showing the URLs currently in the database: https://musicbrainz.org/search/edits?auto_edit_filter=&order=desc&negation=0&combinator=and&conditions.0.field=url&conditions.0.operator=%7E&conditions.0.args.0=share.google%2F*&conditions.1.field=type&conditions.1.operator=%3D&conditions.1.args=90%2C233&field=Please+choose+a+condition.

I haven't come across URLs using a different syntax (so far at least).