No pre-roll ads, no random mid-stream ads, only ads initiated by the streamer
Most of the streamers I watch usually play on the same roleplay server, and my average viewing session consists of constantly changing channels to see the roleplay from another perspective. Pre-roll ads are the biggest annoyance for me. Every single time I swap to a new channel I'm forced to sit through the same **** 30 second ad, and miss a large portion of whatever reason I was swapping perspectives. Random mid-roll ads can be just as bad, causing me to miss entertaining spontaneous situations.
I hate ads, but if ads are absolutely necessary at least leave it to the streamer to choose when to roll them so it doesn't interrupt the content.