@tptacek nailed it on the head. It wasn't a rational thing. It was emotional. All I'm trying to say is that Peldi's generosity affected me in a huge way. It was a tonic—a positive starting point that I've cherished ever since.
My question is more about "had you not been so gracious, Quipol might have never happened".
A mockup software doesn't seem to solve any important pain that can't be solved without and yet I see a lot of mockup softwares being created.
So my question is more about, why is a mockup software so important to you? What did it help you do that you couldn't have done without?
What is it that you don't understand about that? As several posters have already pointed out, the letter isn't about what the software did for him, it's about what the act of generosity did for him.
Peldi's gracious gesture made myoder feel great and gave him drive that helped him finish his product. You're focussing on the wrong thing.