Tragic reporting from Bloomberg about how safer TikTok algorithms were withheld from some users so TikTok could A/B test engagement:

Chase’s account was stuck in a so-called filter bubble, an online echo chamber that pumped out repetitive content the algorithm predicted he’d want to watch. There he received an “onslaught” of suicide and self-harm content, according to the document.

If you accidentally create a harmful product, that’s one thing. It can be fixed to prevent future harm. But if you have the fix and refuse to deploy it widely, to me that’s inexcusable.