GPT Zero was just acquired by Superhuman. But they never spent a dollar of the money they raised. Tens of millions in revenue, fully profitable. It clearly didn't need to sell. Investor @nbt, who sits on GPT Zero's board, said he pushed back on selling a year before the deal closed. He thought the founders had a real shot at building something big on their own. Instead, they did a small secondary. Fellow investor Michael Kim says that the secondary helped ease the financial pressure the…