Only if you already have retention and a clear sense of what a customer is worth; otherwise you're paying to fill a leaky bucket. Most early startups can't profitably acquire on Meta or Google and should exhaust founder-led and organic channels first. Paid is an amplifier for something that already works, not a substitute for it.
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A blunt, practical guide from Demand Curve's founder on which paid and organic channels fit which business, and why most startups can't profitably buy ads early on.