I deleted my Facebook account many years ago so I would say the obligation to resign, to me, probably goes back pretty far. But overall I understand this wasn’t self evident for many for a long time and for many it still isn’t. I wouldn’t peg it at their feed engagement algorithm changes, but I think once people started seeing them creating creepy targeting buckets in their ad system, like “target parents who just had their first child” (how would they know this?) it started to be pretty obvious how fucked up the logical endpoint of that was going to be.