A niche that is too narrow kills automated channels through content exhaustion. A channel posting daily on "horror stories about hotel rooms" will run out of distinct story angles within weeks. A channel posting on "horror stories" has unlimited content depth because the genre is infinitely extensible.

Unlimited content depth
The Story Generator Never Runs Out of Ideas
Duplicate detection built in. Every generated story is unique. Broad niches power unlimited daily posting indefinitely.
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Finding the Right Breadth

The ideal niche is broad enough to generate 500+ unique stories but specific enough to have a clear audience identity. "Horror stories" is good. "Stories" is too broad -- the audience is unclear. "Workplace horror stories" is slightly too narrow for long-term sustainability. "Horror and thriller stories" is the sweet spot: broad enough for unlimited content, specific enough for a defined audience.