I suspect you're talking about some open source you've found somewhere on the internet. I kind of write some myself. And when I think they may benefit to other people, I share them. Remember that these tools are often built to address one particular problem for a single guy in a particular context. And this guy nicely shares them with the world, for free in case they could help someone else.
But they owe you nothing.
This. And if there’s software that can be run “as is”, just left-clicking it in Finder or Explorer, it doesn’t mean it’s written in a “right” way. It means that the person created it deliberately addressed it for people who just want to click and run.