Todd Spangler NY Digital EditorNeedless to say, this isn’t how Kevin Mayer expected his bold career move to go.Mayer, after just three months on the job as TikTok’s CEO and chief operating officer of Chinese parent company ByteDance, said Wednesday that he is resigning amid the tumultuous geopolitical climate battering TikTok — led by Donald Trump’s anti-China agenda — which ultimately will force ByteDance to sell the TikTok app business in the U.S. (and likely other countries).