Open source is both its own best friend and worst enemy. Back in the day, just developing a good utility was recompense in itself. I did that a few times, and the reward was the interest and use by others for the code. But, it brought up a generation or two of techies who expected software to be free (as in beer) and just couldn't be convinced to purchase a program. Borland had a Unix/Linux clone of their excellent Delphi suite, called Kylix, but couldn't even sell enough to pay for a website to support it. Scrivener had one also, giving up for the same reason, I would wager. And those are not the only two by a long shot.
After a while, even an enthusiastic developer wants to move on, especially after fielding demands and complaints from users who expect a top-of-the-line Photoshop or Office suite for nothing, and bug reports to be acted on instantly.
I expect the situation to get worse, given the increasing complexity and security needs of the future.
A shame. I used, learned with, and modified a lot of good, free software in my time.