There's no way to tell hoe many are watching it out in public. It's all bullshit and guessing, just like Nielson ratings. Only streaming companies can give a accurate numbers on thier platform... like Sky and the 700k watching the Warriors for exampleWhile this is valid, its true of the AFL and other sports as well.
Nielson have rolled out Out of Home Viewing in the US, trialling from 2014 and including it in national ratings since 2020, with trials suggesting sport receives a 14% lift early on. No timeline for this to be introduced here.