I recently found a video about a slightly older game called Clustertuck. The game is not so special but the devs can influence the game by changing some values or material properties of a specific user. I think that its a funny concept but I have no clue how to do something like that in unity or in general.
Because – in my nooby opinion – you have to identify the user you want to troll and then you have to access functions already implemented that can do stuff like output a string you send or change the pp.
So as I said it should be just a general discussion talking about the concept and how you would do something like that, because I’m not that deep into the online systems of unity 🙂