There's actually plenty of room for that type of programmer personality: the jobs at non-software companies where programmers are a cost center. E.g. enterprisey - line-of-business - type of programming. Actually, the "back-office" type of software dev is the majority of programming jobs out there. Yes, there may be a few "enterprise" managers here or there that might be impressed with extra-curricular programming but it's often not a reasonable scenario. (E.g. virtually no programmer that knows a 4GL like SAP ABAP language (business process programming) will be maintaining a github profile full of ABAP code.)
It's the founders and managers at tech companies that value the developers that enjoy programming on their own. The founders themselves often started programming as kids and so it makes the most sense to them to try and attract programmers with the same enthusiasm.
There's nothing wrong with wanting to be strictly a 9-to-5 Mon-Fri programmer. That life approach meshes better with companies outside of Silicon Valley.