He’s swimming away. Photo: Christopher Willard/ABC via Getty Images Here’s the deal: Mark Cuban is done doing business with Shark Tank . The season-16 finale airing on May 16 marks the billionaire’s last episode as an investor on the ABC show. He appeared to be in good spirits on the final day of filming, dancing on set and reflecting with amazement on his journey in a behind-the-scenes video posted to Instagram . “Three pitches left. How insane is that?” he said. “I mean, that’s just the

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