True, but that's the investor's problem, not the employees. They'll end up losing their jobs in the end and move on, but it's not like people in other tech company never lose their job either. The good thing when it eventually happens is that there will be a lot of senior Rust developers that are needed by most company to even start doing things in Rust.

Is their work pointless? Sure. But aren't Googlers' jobs not pointless too? That's the sad state of the 21th century: most people have a bullshit job but they need it to pay their mortgage.