I feel there are a bunch of items here hiding in this request:
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Allow anonymous users to know a channel exists: eg: All Star - Discord Servers
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Allow anonymous users to see the content of a specific channel (Eg: twitch)
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Allow search engines to see content of a specific channel. (not finding too many examples)
I feel like (1) alone gives tremendous mileage. (2) can be interesting (3) feels like the riskiest play due to low quality content.