I can see why people are worried, and it's valid, but I also trust the devs are making correct choices
Periodization is hard; it's been five years since Rust 1.0. The project is much older, but the language as we know it today has only been around half that time.
I don't know if that statement is really justified. Sure, Google is a much bigger and more influential company than Mozilla. But when taking the average over the entire company, all-of-Google supports Go much less strongly than all-of-Mozilla supports Rust, and I think that pretty much cancels each other out the company size, so I would consider both langs to have roughly equal corporate backing.
I think the actual difference is that Go has a much larger immediate audience than Rust. Go appeals primarily to developers of web service backends, who are coming from Ruby/Python/Perl/PHP and are looking for something faster and statically typed. Rust OTOH initially mostly appealed to systems developers looking for a better C/C++, although that audience has been steadily expanding since then.