What one customer costs to acquire and serve against what they pay over their lifetime — the arithmetic that decides whether growth makes you money or loses it faster.
A product can grow quickly and still be a machine for destroying cash. Until the maths per customer works, more users is a bigger problem, not a bigger business.
We instrument acquisition, activation, and cost per active user from the first release, so the economics are measurable before the marketing budget scales rather than reconstructed afterwards.