This is often being done by the mods of the site though, and not by the submitters. I've had it happen to a post of me, and I've seen multiple comments by other submitters that the post title was added to include "in Rust".

I'm not sure what the incentive for the mods is here (overall higher engagement on the site?), or if it's still being done, but from a certain point on, I think it could even be harmful to Rust, by preventing it from being recognized as a "normal/mainstream" language.