opt-in is complicated.

If I own a repository on github and I have received contributions from other people, or included a .h file from mpv (thing that I have done), do I still have the right to click the opt-in button? I didn't ask the other contributors.

But github is in a position to scan my code and see if there are copy paste bits and disable the opt-in button in that case.

Except they act in bad faith so they wouldn't do that.

> I dont think that would work very well because there are not infinite ways to succinctly solve most programming problems. In fact the majority of solutions will look exactly the same.

Algorithms can't be patented or copyrighted, as they are pure mathematics. If an implementation of an algorithm has no creative content because it is succinct then it likely doesn't deserve copyright.