Most of the support staff is their customers and users actually.
Most of the store is curated and moderated by the developers and publishers, but you’re not wrong about stuff like server farms and development.
But I’m also curious, there’s a line, so where is it? No business is going to include the plumber and electrician they hire to do occasional or even routine work and maintenance. So do the same techs working on server equipment count or not? Where’s the line on this who’s a contracted employee instead of contracter.
Most of the support staff is their customers and users actually.
It's not users that process refund request, recover your account if e.g. you've lost your 2FA method, or any of the other innumerable things you might need to contact Steam support for. I don't think it's unreasonable to include the staff that do this as part of their workforce.