I grew up staunchly against cheating. Becoming an adult was hard. My whole university class cheated on a tough assignment - someone found the solution online and shared it around. I didn't look at it, took the challenge and gave it a lot of effort. I got a pretty bad mark and the rest of the class got top marks. I also see the same mindset in work. People don't prepare for presentations and then spitball when present…
I don't bother prepare for client support calls, mostly because I don't want to do them and want to be considered incompetent at them so I am not asked to help in the future as much. So at least for me, presentations are nothing but more work.