Yeah I was really talking about two slightly different things

* Need to notify users about something (not something that requires new consent, just a service announcement like a breaking workflow change). Use emails, uncloseable banners for a month, forced modals, whatever. Users still claim they didn't see it despite proof that they had seen the modal and banner many times

* New feature exists. User explicitly enables it despite a very clear explanation of what it does and simple yes/no buttons. User clicks yes and then complains that it was enabled automatically without their permission. The stuff I work on doesn't deal much in personal data so this wasn't even legal consent, just power features that can cause harm if used flippantly

Not exclusive to development either. I hear the same stories from sysadmins on a weekly basis (of users ignoring any IT communication and clicking buttons randomly without reading, then blaming everyone but themselves). Probably similar stories from any non-tech service job too