I think that difference is that Deno is some kind of commercial startup and Rust feels like community project backed by few huge corporations. So Deno needs to generate hype while Rust's not hurrying anywhere.
Are you familiar with the concept of no-2.0 for Rust? The do this on purpose so the users (the software engineers) never need to convert a version x project to a version y unlike for example Python (2 -> 3). I think this is amazing.