Simple utility stuff I believe should fit in this category. Things like a text editor.

The profit comes from elsewhere, larger more complex systems.

Of course someone can TRY to profit off a text editor, but unless it solves complex enough problems (like a full blown IDE, but even then...).

The issue is there is intense demand for it, and ALSO easy supply. If someone attempts a profit driving rugpull, another will pop up in it's place.

I am still using Dendron because it meets my needs, but I'm always half tempted to replace it, and I'm fairly confident I could come up with something that meets my own needs in a day or two, and it would likely also be valuable to countless others. I just keep assuming that someone else will spend that day or two, and my pain points with Dendron are not that bad for me to spend the time.