Paint.net was originally MIT licensed but the author closed its source because people did not give him credit. Note: The MIT license does not require credit.

https://blog.paint.net/2007/12/04/freeware-authors-beware-of...

Paint.net likely still benefits from the announcement of "Open Source Alternative To Microsoft Paint" long after switching to a proprietary license, which I find more dubious than using MIT-licensed code without giving credit to the author.

Yes! This is by far the number one program I've missed since I left Windows years ago. GIMP is so unfriendly, krita is for drawing, pinta is a very shallow clone that only just stopped crashing a few months ago. Paint.net is just better in every way.

Sounds good, but why a .Net app can't work with .NET 10? Does it use Windows-only features?