Facebook literally did this study. Not, as an AI thing, as in Data Scientists actually did a study on the rates of depression when you changed people's news feed to show primarily positive and negative news. And then Facebook used that data to tune how negative they could make the feed and still drive engagement.
One of the signals they were getting from that study was suicide rate. I'm not certain how it was measured; I don't care. I saw that it was measured and decided that it was not a place I could stand to work.
Their standard operation is to preform studies that wouldn't even be laughed out of an ethical review committee. They don't blink an eye. They just don't begin to view their users as humans.
Facebook are war criminals. There's nothing more to it.