You really screwed the pooch on that one. The FSF likes you to sign over copyright when you contribute to their GNU software collection (not the tens of thousands of GPL programs, just their GNU collection of about 300 programs), but it is not necessary. So much for "most GPL software."
Withdraw, or do we mark this one down as a lie?
Maybe it was a mistake. But I'm not really sorry since only leftists were accidentally insulted.