Put a face on both ends of a call and people behave differently. It is harder to be rude to someone who is looking straight at you, and much easier to be kind, because you can see the moment a joke lands or a question goes slightly too far.
Small talk works better too. On a text chat with a stranger, the first five messages are almost always the same: where are you from, how old are you, what are you doing. On a cam to cam call, the room behind each of you does that work for you: a guitar on the wall, a half-eaten dinner, a dog that refuses to leave the frame. Conversations start from whatever is in view, which is usually far more interesting than a list of questions. Match with someone eight time zones away and it is breakfast on their side of the screen, you can hear a kettle or a tram outside their window, and before either of you has asked a single question there are already three things to talk about.
Then there is trust. When only one side is on camera, the other side is a blank square, and nobody quite knows who is there, which is exactly the imbalance a cam2cam call removes. You both show up. You both get to decide, within the first few seconds, whether you want to keep talking.
Plenty of people use a two-way camera to practise a language with someone who actually speaks it, since watching a mouth form the words helps more than any app. Someone who has done two years of Spanish on a phone often finds that ten minutes with a person in Buenos Aires who laughs, slows down and says the word again teaches more about how the language really sounds than a whole month of flashcards did. Others simply want company on a quiet evening. Some want to hear an accent from a country they have never visited. None of that requires a performer, a subscription to anyone or a crowd. It needs two cameras, two people, and a way out when it is not working.
There is also something quietly old-fashioned about it. Before profiles, ratings and swiping, the way you met a stranger was to stand in the same room, look at each other and decide in a few seconds whether the conversation was worth having, and a cam to cam call puts that ordinary, slightly awkward, very human moment back at the centre of things instead of hiding it behind a photo you chose on a good day.