Look, you can argue about the existence of social norms till the cows come home, it won't change the fact that there is a non-trivial subset of open source deve

Look, you can argue about the existence of social norms till the cows come home, it won't change the fact that there is a non-trivial subset of open source developers and users that believe the lack of discrimination of any kind is exactly the point of Open Source. The definition is not stipulating these rights indiscriminately by accident, and it did not have to be written that way. I will acknowledge that some people in the community clearly believe that enforcing unwritten social rules with regards to Open Source is the best practice, but I don't accept that this is the common or obvious viewpoint. I think that viewpoint is overrepresented in spaces like Hacker News with a lot of startup-adjacent folks but even here I wouldn't expect the majority of people to agree with this. P.S.: This all having been said, while I think that there aren't commonly-shared unwritten rules w.r.t. who may do what with open source software pertaining to its copyright license(s), I don't think there's absolutely no "unwritten rules" in open source. For example, I think the CLA rug-pull pattern is a pretty dirty trick, but that has little to do with open source licenses and more to do with outright deceiving people. And even then, it does beg the question of why you would agree to sign something that explicitly grants that right when there is absolutely no reason to do so.