This is a brilliant blog post.

What happens if you write to the address listed in the GPL?

https://code.mendhak.com/gpl-v2-address-letter/

I wrote to the address in the GPLv2 license notice and received the GPLv3 license

I was curious about the 51 Franklin Street address in the GPLv2 license notice so I wrote to them as they said

@Edent ha! never thought of that :)

@Edent I particularly like the admission of not having used a pen in years

My handwriting was always sub-par, but I've noticed that I'm less alone in that these days! Luckily for me if I'm writing by hand it's usually notes for myself, so I've actually developed a writing system that only I can read. It's called "shit squiggles"

@Edent gives me flashbacks to a time I had to (while helping my dad fix a printer issue) dial long distance from Canada to California into some BBS-like system to get updated drivers because the internet basically didn’t exist yet or HP didn’t have drivers up at the time. Luckily it worked and didn’t cost too much. It all seems like a dream now.
@Edent "As a postal introvert, I will now need a long period of rest to recoup." - incredible, i love the candor
@Edent Getting the v3 was a bug. The person requesting would have no way of knowing which version they needed. The software in question was obviously published under the v2 license, which has different clauses. That's the one that should have been received I think.
@Edent How is GPLv3 different?
And why did you get it in the mail?
If I want to get it, do I have to follow the same procedure?
Can't I just copy and paste?
@universish I didn't write the blog post. Please address your queries to the author.
@universish @Edent
GPL v3 is different from v2 several ways. It covers some additional situations that weren't anticipated in the original version, which makes it more technical. It also defines a lot of the terms whose definitions were assumed in v2, which makes it longer and more legalistic. Some developers, Linus Torvalds being the most obvious example, don't like v3 and have stuck with v2.
@Edent I've had multiple opportunities to delve into the worlds of international postage and shipping. And writing by hand with a pen! That was an enjoyable and familiar explanation.

@Edent I strongly suspect that mailing the GPLv3, rather than v2, was deliberate.

Official FSF policy is that the GPLv2 should no longer be used, and since the original code probably has an "or later" clause (although they didn't verify this!) that the GPLv3 was "a license" that applied to the code, even though (a) it wasn't the original license and (b) it was more restrictive than the original license.

Just some ideological purity bullshit to try to coerce the correspondent into using their preferred license.