> feels a bit tragedy-of-the-commons ... I can't quite get the analogy straight in my head

I have a personal theory that "tragedy of the commons" has a very specific meaning, and beyond this meaning it just adds confusion. This isn't your fault - it's an overused phrase.

I'd try to examine the root of your discomfort. Why does it make you feel bad? Avoid thinking about "big ideas" like the commons or the public good.