Quote from SeerahMy addons are ARR because I don't want other versions of my addons floating around in the nether with other people coming to me with random bug reports. I also don't mind if people ASK to use a snippet of code, but if you downright steal it, I won't be friendly. It's much better to learn from something and code it your own way.
Lastly, the patch JUST went live YESTERDAY. Give them a week before asking about taking them over. If you wanna submit code to their authors though, they might appreciate it.
That's a valid point. My original thinking was: if some dev suddenly decides not to play wow ever again and just leaves everything as is..
It is also my understanding of, for example, the MIT license that you need to credit the original dev.
No one should ofc modify and redistribute code that is ARR without permission. But I don't see a problem if you write your own code from scratch based on observations of how some other code work (or based on your own memory and screenshots in case of old broken addons). Where 'observe' means looking at the GUI or effect of the code, not the actual code itself.. Ofc it's cumbersome to resurrect an old addon that way. But if the licence is ARR and the original dev has decided never to work on the project again and never reply any requests again, then the cumbersome way is probably the only way.