Yeah the communication protocol is simple enough you could easily wire up some kind of "vote to change scene" functionality.

Except it controls your OBS instance itself, so the scene would change for everyone at the same time.

I think they're imagining more along the lines of Twitch Plays Pokemon[0], where that's a feature, not a bug.

[0]: https://en.wikipedia.org/wiki/Twitch_Plays_Pok%C3%A9mon

Would you please go into more detail about what viewers might want to see / configure for viewing? I’m presuming it is some selection of meta overlays on top of a primary video feed. Is that correct?

That's a good example, but I've seen a good few people streaming (usually people who aren't primarily known as streamers and have dipped in their toe during the pandemic) and now and again start doing something on their computer without changing scene from the full screen webcam. A public voting system to change scene could allow a person's audience to choose the right scene.

Obviously needs guards to make certain scenes ineligible for voting (e.g., anything showing the full desktop) so people can't attempt to see anything sensitive, but allowing certain scenes (e.g., those capturing games) could be quite useful.

Basically what @mrkwse said.

Another use case would be for esports, where spectators could potentially vote which team they want to spectate each round.

In SimRacing it could be used to select Cockpit camera, Track Camera, ...