Unverified50% confidenceSolutionExact time
「祖父条款」（Grandfather Clause）策略被视为维护用户信任的行业最佳实践，Spotify、Netflix等公司均曾通过此机制降低价格调整带来的用户流失
1
Sources
50%
Confidence
Long-term
Relevance
7/13/2026
First Seen
Sources
Perplexity Max额度从40K缩至10K，付费用户该怎么办？
redditr/perplexity_ai7/12/2026
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