The fact that they are in the URL serves an additional purpose for these sites - to identify who is sharing exactly what, and with whom.

(I've noticed that TikTok does this explicitly, providing a different short URL for each share request - it's clean, which makes them easier to share without blocking out a whole chat, but still not wanted)

It's not that I don't mind the parameters, it's that I also mind the URL tracking. And I can do something directly about the URL tracking.