My understanding is, if the fediverse is a web of instances (being the server/domain you signed up and have an account on), ‘all’ only has the context of everything on your home instance and stuff people on your instance are subscribed to.
So not just your own personal subscribe, but the entire subscribe of any user from redlemmy.com in your case.
Your all is likely different than my all. There is no true ‘all’ because of how communities connect and aren’t contingent on each other’s existence, and things like instances defederating from others.
Is that a joke? There’s no fucking way me, or my team, or my manager, have any desire, or time, to sift through hundreds of resumes to fill a role. Even dealing with the few that make it through initial screenings is cumbersome.
As long as the base requirements are properly established by the team, and HR ought to be capable of filtering down to good-great candidates for any given position.