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That was the first one I saw and it immediately killed the site for me. Real rejection letters would be interesting to see.

Would be funnier if they said, "Try Deepmind."

I think the joke hints at the recent events when Sam Altman has been fired (for a few days) and MS announced that they would take over the whole team as they said they would quit in response to Sam being fired.

Yeah, the PornHub one is clearly a bunch of jokes, it is funny, but no way it's real

It definitely got raided by trolls. The second post is Super Mario Goatse (nsfw).