Yeah, I've thought of this too. I was thinking you could just use a normal mobile network, as you'll just be sending the correct color to a full screen (not a ton of data needed for that). I was thinking that a website serving up web socket connections would be the best way to send the data, no clock sync needed.
Just spin up $10K worth of AWS instances for a few hours to handle all of the connections, and done.
Just spin up $10K worth of AWS instances for a few hours to handle all of the connections, and done.