> and hope that it's what the author wants and has time
Yes, that's how "this isn't mine and I would like to have it changed" works. You're free to want things, you're not guaranteed to get them.
> What if I can't do better? It's unfortunate I can't learn.
Then no one still owes you anything, and the fact that you get to use this software for free is still a miracle.
As for the "needing internet access": what an absolutely ridiculous thing to say. If you need a great offline image editor, just download one. There are plenty, Gimp, Krita, etc. all work perfectly fine if that's what you need, but it sounds more like you're upset about the fact that THIS particular one isn't also free for you to do with as you please, and that's just ridiculous. If you need a good offline image editor, you already have options unrelated to this amazing web offering that the author has zero obligation to make free, let alone open source.