Semi-open thread: blackmail

My black­mail posts have gen­er­ated some in­ter­est­ing dis­cus­sion, so I’m just cre­at­ing this one so that peo­ple can post ex­am­ples of be­havi­ours that they think are ei­ther clearly black­mail, or clearly not black­mail, or some­thing in be­tween.