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Code being copied isn't an issue. I knew full well what it meant to release something opensource and I don't regret it one bit. What was copied with no credit is the foundation of the project. How it actually works. If I were the patenting type, this would be the thing you would patent. ps. I don't regret not patenting anything. And I don't mean the general concept of package/app managers, they have been done a hundred times. If you look at similar projects across OSes, Homebrew, Chocolaty, Scoop, ninite etc; you'll see they all do it in their own way. However, WinGet works pretty much identical to the way AppGet works. Do you want to know how Microsoft WinGet works? go read the article (https://keivan.io/appget-what-chocolatey-wasnt/) I wrote 2 years ago about how AppGet works.
I'm not even upset they copied me. To me, that's a validation of how sound my idea was. What upsets me is how no credit was given.
I try to assume no bad intentions these days.
In the past, I've been in talks with an employer about a job, and my enthousiasm was only so-so, and that tended to put a brake on the proceedings.
I too have been in a similar situation (being interviewed at a startup and being clearly not super enthusiastic about the position being offered) but they decided to go with somebody else they gave me a courtesy call letting me know about it. I think it's the right thing to do.