People seem to be blaming google/twitch for this but it's quite simply not their fault. Because of the amount of time that this has gone unnoticed and left alone, the RIAA can sue them for any fucking amount of money they really feel like.
I'm pretty sure that Google also do not want to have their whole content ID system in place, but because of the mounting pressure from the record companies they literally have no choice. All these guys have to do is say "this has cost us £5.3 Billion dollars in missed revenue" or any other retarded amount like that and either try and get that money or get the site in question shut down.
This is a problem with the archaic laws that are in place that have nothing to contribute to a growing digital world.
If this does escalate then people are just going to move to the next platform, we will just go around in circles.