Allow Streamers to Host Subscriber-Only Streams
Some streamers currently feel that there isn't enough incentive for people to sub. I think that streamers should be able to have a stream that is only visible to subs, similar to the sub-only feature for VoDs. This could allow creators to reward their subs for supporting them and to give non-subs more incentive to sub. I understand that some streamers might begin to only do sub-only streams, but I think that should be their decision, and that they will almost certainly lose viewers by doing so. They need to decide whether or not the few gained subs would be worth the lost viewers. I think this system would really benefit creators who have their viewers in mind and want to reward their subs for supporting them.

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yukivt_ commented
I know twitch offers "sub only streams" but non-subs are still able to find and watch the stream for an allotted time period. But it'd be better if it was more like how YouTube has members only streams and ONLY subs would be able to find and watch said stream. It'd be nice for those who want to play games like Jackbox, but don't have a discord to send the code through, to prevent random people joining the stream, entering the game, and then doing something TOS in said game just to ruin it for the streamer and subs who are participating.
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mandyqt commented
Similar to how Twitch Parties work, however you need to be subscribed to the channel to watch the broadcast. This feature should be available to partnered streamers to avoid any misuse (illegal broadcasting etc). It's a win for the streamer (and Twitch), who ultimately will receive more subscriptions for people to watch the content.