Ada asks you to compare four versions of GNAT and prominently displays "request pricing" buttons. Rust gives you a compiler, a package manager, some IDEs with Rust integrations, and a link to the Rust Book.

In point of fact, Ada has quite a bit of historical baggage/inertia as a proprietary language sold to well heeled defense contractors while Rust has a great deal of effort put toward community engagement and onboarding. Given that Rust now has a "cool" factor that Ada lacks, it's not surprising that people in the "market" for features both languages provide would gravitate to Rust (or other less popular but more engaging systems language communities).