Spends $3–5 per install on CAC

- Startups report median customer acquisition costs around $3–5 per install when buying traffic, a range that’s forcing tighter PMF scrutiny. (x.com) - Founders say true product–market fit shows up as organic signups, raving users, and repeat payments, not just paid-install volume. (x.com) - Many warn that scaling with high CAC hides a fragile funnel that collapses when obvious buyers run dry and ads stop converting. (x.com)