I'm not sure I'd agree, the moves of a Chess game aren't really analogous to a broadcast. They're a lot more like a box score a play by play summary of a sport

I'm not sure I'd agree, the moves of a Chess game aren't really analogous to a broadcast. They're a lot more like a box score a play by play summary of a sport which I think are both legal to share. A broadcast of a chess game would be the analog of the broadcast of a sporting event. Unfortunately people aren't really that interested in Chess broadcasts, they'd rather just see the moves.