Unverified50% confidenceOpinionExact time
纯粹基于更好地调用某个底层能力建立的 AI 应用护城河往往极浅，VC 界称此为层叠风险（Layer Risk）
1
Sources
50%
Confidence
Long-term
Relevance
7/10/2026
First Seen
Sources
Why Perplexity Fell Out of Favor: The Moat Problem Facing AI Search Products
redditr/perplexity_ai7/9/2026
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