Why installs don't turn into MRR
If you're running paid media for a subscription business and your installs or signups are growing faster than your MRR, the gap is usually this: paid media optimized for the top of the funnel buys you volume, not recurring revenue. To grow MRR, the ads have to be pointed at the thing that actually becomes MRR, the paying, retained customer, not the install that looks good on a dashboard.
It's easy to assume that more top-of-funnel means more MRR, because the funnel looks like a straight pipe: more installs in, more revenue out. But a subscription business doesn't make money on installs, it makes money on people who pay and keep paying. When you optimize ads for installs or free signups, the platform does exactly that and finds the cheapest possible installs, many of which never subscribe. Volume climbs, MRR doesn't, and the two lines drift apart.
Aim the ads at the event that becomes revenue
The fix is to aim the ads at the event that becomes revenue. Instead of optimizing for the install or the trial start, optimize toward the paid conversion, or the in-app event closest to it that you can track reliably through the SDK. Now the platform stops chasing cheap signups and starts looking for people who resemble your actual subscribers. The cost per signup usually rises and the cost per paying customer falls, and it's the second number that turns into MRR.
Retention is half of MRR
But acquisition is only half of MRR, because MRR is recurring. New subscribers only grow it if they stay. If churn is high, paid media is pouring water into a leaky bucket: you fill the top faster while the bottom drains just as fast, and MRR barely moves no matter how much you spend. This is why retention isn't a separate "product problem" from your ad strategy, it's the thing that decides whether your ad spend compounds into recurring revenue or just rents a stream of customers who leave.
So judge paid media by cohorts, not by launch-day signups. Look at the customers a campaign brought in and ask how much recurring revenue they're still generating weeks later. The campaign that wins for MRR is rarely the one with the most signups. It's the one whose customers were worth keeping, optimized toward paying users and pointed at a product that holds onto them.