One of my GitHub projects was used in a demo at Google Cloud next a while ago. the presenter was considerate enough to attribute the project to me by name during the demo and even sent me an issue just letting me know about it. That was so nice! Absolutely people should do this.
I actually had someone take one of my personal iOS apps from GitHub (https://github.com/wcochran/calfoo) and submit it to the app store as if it was theirs. Someone else told me -- I was gobsmacked that someone was so brazen. Oh well, I didn't license it. It had special features that only mattered to me (and would be inappropriate for general use).
Just fyi, if something is unlicensed, then other people can only use it under fair use. You’re the copyright holder automatically upon publishing and retain all rights. If you intend to let people do anything, then you need to explicitly put it in the public domain or use an appropriate license.
It’s very unlikely they can legally do what you’re describing… but it’s up to you to enforce it.
One of my GitHub projects was used in a demo at Google Cloud next a while ago. the presenter was considerate enough to attribute the project to me by name during the demo and even sent me an issue just letting me know about it. That was so nice! Absolutely people should do this.