While I don't hate Rust (even have a couple of private projects written in Rust, and plan to use it in the future also), I wouldn't really call it fun, as a personal opinion. I find Rust code usually pretty ugly, and some of the abstractions can make it challenging to understand. Compared to it, C is plain and simple. I still find more joy in writing C code - though for some goals it isn't my first choice.

As long as they're having fun :)