I know this is a very unpopular viewpoint. A lurker doesn't contribute to the stream in any way. They sit in chat, don't watch videos or they will watch the video but with the sound muted, which doesn't count as a view session on a video on demand feature or livestream.
I can't tell which is a lurker and which are bots. I assume all lurkers are bots and should be banned.
Come up with A.I. as an extension to download to find bots / lurkers in chat, give them warnings to either leave the channel permanently, speak up in an intelligent conversion or face permaban.