Hmm... if you are part of the creators of the project, of course. Now if you don't like Rust, you should not become a maintainer of a Rust project, it's as simple as that. No need to go complain on every Rust project you find online.

Same for your own project: don't become dependent upon a project that you don't want to have to deal with... If you do, then don't go complain about it: you made the choice to depend upon it.