Google has already started to use Rust in their android operating system. Linux started getting Rust stuff. Rust has the speed of C/C++ while having memory safety. Zig does not have the same memory safety as Rust, it's a mere C/C++ alternative. Does that answer your question?
No, CAPTCHAs can and will be bypassed.
But you can make it expensive for bot hosters using PoW CAPTCHAs instead of normal ones. It's also better privacy-wise.
redstaros is better