At 100s of km, you’d be pushing the limits for actual live sound, though. 100km is about a light-millisecond, and ordinary fiber is rather slower than light, so that’s maybe 3ms round trip per 100km. If a musician can hear themselves through monitors at too much more latency than that, it could start to get distracting.
As i understand it, the sound for audience in the venue and monitors for artists was run locally by separate mixer. The audio backhauled to HQ was for the live broadcast.
