> Seeing fireworks in non-rivalrous, but being somewhere is ... BTW, the title doesn't make any sense

Neither does your comment! What do you mean 'in non-rivalrous, but being somewhere is'?

The article uses the term. If there is a star in the sky and I see it, I don’t consume it so that you can see it too.

But if I occupy a spot, I “consume” that so you can’t be there simultaneously.

So there is rivalry if we both want to be there.

Yes but 'in non-rivalrous' doesn't make any sense.

It took coming down to your comment to realize that GP had “in non-rivalrous,” I’d just glossed it over and assumed it said “is”

Being in a place can be thought of as a rivalrous good because other people cannot simultaneously be in that place.

s/in/is