If the former, people share all sorts of oddities in their own personal space especially life-changing events of which career moves is one.
If the latter, a lot of people follow "developer influencers" to keep up on the cutting edge trends. I'm personally keeping an eye on the Rust Book and hoping it maintains its high quality so that's my investment in this. I'd go the other way and say it would be borderline irresponsible of him not to publicly state he's moving off Mozilla's payroll b/c of so many of us depending on his super-active involvement in and documentation of Rust.
> why am I reading this?
Yeah, why? A better question is, why are you commenting on not wanting to read it instead of just skipping and moving on?