Because what is the point if something is distributed in a restrictive license, can't be preserved and then gets lost to time? Also, licensing is to avoid distribution, modification or outright copying by competitors; preservation is completely orthogonal to those concerns. It is to avoid losing a piece of craft to the sands of time. There is no reason laws should have power over anything in perpetuity.
As seen in other spaces, pirates ignoring the "law" will provide the greatest service to humanity.
If the rights holders of the licensed bits haven't abandoned them, then it's not really fair to distribute them without their consent.
Also, we're not talking about personal code either, but something that is arguably a product humanity, or a part thereof, would want to preserve for posterity.
Lastly, no one is telling you to open anything. I am saying that if someone decides something you have created need to be preserved, they should go ahead. You can protest, you can sue, the point is it shouldn't stop anyone from trying. Which doesn't apply to this case, as the owner of Winamp actually wanted to make it open source.
And the license matters. We're talking about something owned by a company somewhere, legally. Humanity's concerns don't matter in business and legal affairs. As I stated above, I agree that we should be able to save everything. But this has nothing at all to do with what's good for humanity. This is about money and copyright law.
Also, OK, your personal code is not licensed. Great, now I can take it and license it myself, copyright it myself, and then sue you for hosting it in your github account. Hey, I'd be in the wrong, but if I lawyer up I can just win by spending money and waiting you out. This is the world we live in. It's not good, but it's reality.
This is not true. You can't redistribute someone else's IP without a license from the owner.
Who is telling you that? Literally no one. In my original comment, the preservationist is NOT the author, as it's the author that is liable to be sued by releasing proprietary material.
In my comment, the preservationist is a third-party that should NOT be concerned with such matters, even if being forbidden by copyright law. Imagine the Internet Archive, which already operate this way, and I applaud, because the service they offer is better than if they had to respect all legal nonsense.
No one is telling you to do anything with YOUR code, and code you are legally liable for. No one is putting a pistol to your head, so I don't get why you are being so defensive to my admittedly unpopular opinion. Do whatever you want.
In my country it's legal to do so -if there's no profit- on media, but not for propietary software with sharing restrictions.