Be all that as it may, this is still a “why not Linux” line of thinking, rather than “why FreeBSD”, which is the more interesting question. And it is not a binary choice.
Because FreeBSD is a perfectly fine OS for server type stuff, and maybe it's better for this, that, or the other thing. So someone probably picked it and it has worked ok for them.
Just to be clear, you don't need to convince me - I've been preferring BSDs for my own infrastructure since the 90s. But I'm mindful that the discussion can quickly become polarised and winds up with negative framing or binary assumptions, which isn't helpful for others asking the same question.
