I don't mind Zoom cameras on/off either way, I usually have mine on when I'm expected to contribute, and off in a large group when I'm in the background listening.
Our small team has new members. Myself and a colleague do the majority of the talking so we always have them on. The new ones are listening in to learn and have them off - they won't have any contributions for a good long while. The colleague complained to me that he's never even seen them and feels like he's talking to himself. Asked me to ask them to turn on the cameras as I know them well. We'll be working remotely for foreseeable future.
Is it unreasonable to ask them to turn cameras on? I agreed initially, but now thinking about it I feel uncomfortable being the one to ask.