I don’t get it because if you look on the valve careers site they’re hiring for specific teams (like steam for example) What happens if you hire someone and th

I don’t get it because if you look on the valve careers site they’re hiring for specific teams (like steam for example) What happens if you hire someone and then they say “nah working on steam is boring, I’m gonna go work on something completely different” How do you financially allocate head count if people can just leave the project whenever?