I think Zoom throws up a consent screen. Obviously if it's some 3rd party thing that joins the call as a recorder, you don't get that.

This is one of those obvious but subtly inappropriate things that just kind of gets foisted on people. Nobody raises an eyebrow, or their voice, and so it's just normalized. Imagine walking into an in-person meeting to find a camcorder set up on a tripod - and if that isn't weird enough, none of your co-workers make a comment on it or acknowledge its presence. It's like pervasive but discreet cameras in public places vs. Surveillance Camera Man making it obvious by sticking a camera in your face.