"We don't want any of you to use any addons. If you use them it's all your risk and responsibility, we can't stop you from using them. We don't have a way to know what you have installed and currently use and we don't want to bother dealing with it. So, IF you do use them, be discreet, don't get caught."

Since the beginning of times, that was set in stone... with multiple reminders. Since the same time, the majority of the community has abided with the simple rule of "don't show, don't tell". In many cases, people that stream with any are minimal enough that they either don't need to bother with it or simply flies under the radar.

But when you CAN SEE at the very least half a dozen addons on a stream... well, I don't know about you but that goes far past the acceptability limit.

The reason they can't put on a list is, as others said, because they'd have to be responsible for spending their working time to make sure they do what they are only allowed to do. An endless discussion and a can of worms NOBODY wants to open.