Iāve just tried to share a link, and the shareable link Discource gave me was https://community.openstreetmap.org/t/official-statement-by-open-street-map-moderator/1054/4?u=someoneelse. In the context that I wanted to use it, the fact that that link included my userid wasnāt a problem, but Iād imagine that in most contexts it absolutely would.
Can the user be removed from share links by default?
It seems this is being discussed upstream:
It seems that a setting to switch this off will be available in the next Discourse version (2.9) 
This is already implemented in the beta version
Once 2.9 moves to stable we will be able to remove it.
Weāve since rolled out the Discourse version which introduced the ability to disable this behavior at a site level. Seeing how this appears to be the consensus solution, Iāve now disabled the āallow username in share linksā setting in the admin panel. The username will therefore no longer be included in the URLs generated by the āshareā button.