Multi-Room Not Working

Hi all,
I don’t want to hijack this thread, just have a similar question for you guys, to which I found this before:

Could you please clarify, if I am streaming the same Qobuz music simultaneously to a grouped zone of 3 RAAT endpoints, but one of them is muted:
Do I consume 3 × the same bandwidth, so also for the muted endpoint?
I ask because I have limited data volume for my 5g router. So if this is true, would I have to ungroup zones to save data?

TIA