Here's your summary from Probably not. (https://www.youtube.com/watch?v=6Fgcsv_ksAI) on the Y Combinator channel:

**TLDR:** Spending money to acquire users for a free app is not recommended as it often leads to temporary spikes in numbers that eventually drop back down.

1. Founders of successful free apps typically find cost-effective ways to reach a large audience without paid acquisition.

2. If experimenting with paid acquisition, set a clear budget and specific goals for learning purposes rather than simply buying users.

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