If the big bang had never occurred, queer.af would never have died.

Ergo: big bang killed queer.af.

QED

They almost certainly picked it just for the joke.

queer.af = Queer AF = Queer as removed!

It’s like how popular the TLD of Guernsey (.gg) is with gaming websites.

I wouldn’t be surprised if they didn’t even realize what country code the TLD was when they registered it.