Yeah, sorry I was still in grouchy morning mode. I sometimes post, re-read and realise I'm an ass and quickly edit.
I also deleted the bootlegger comment at the same time as well as I realised he'd not personally profiting from it so it's materially a different scenario, so I agree there.
But, I think you're looking at it the wrong way. The quality doesn't matter. Even if it were at 4 px density and colossally compressed audio. Sharing exemptions tend to be limited in scope, lending the physical copy so you can't use it at the same time, less than X number of people at a shared screening, etc. Some of the scenarios you can come up with are technically illegal, just no-one's going to enforce them. You might not remember but back in the day coaches weren't supposed to screen films from video tapes and it was explicitly stated in the copyright notices, but they did any way. They probably still do. But if a free cinema had set up and just started screening bootlegged films, they would have got raided and convicted because of the difference in scale.
Say I share a TV show or two with friends electronically. At worst if the law found out they'll tell me to cut it out. If I start hosting the TV show on a website and 100,000 people download it, you can be damn sure someone's going to ensure I'm going to feel the full scope of the law down my neck.
It's the same with this. If it hadn't got shared outside his friend group, even if they found out, no-one would have probably bothered doing anything apart from maybe send a warning not to do it again. But he knew 100,000+ people were using his stream, he was identified, contacted and he declined to stop. That he was ignorant of the law, or he was sharing in a newish way is not a defence.
From my pov, this isn't even new, my old housemate used to stream football games from illegal streams every weekend, I don't really see how this is any different just because it's using Facebook.