A customer came in every week, bought a latte. Then just stopped. Not because they didn't like it — they simply forgot, or a new cafe opened nearby.
Without analytics, you won't even notice. Among a thousand customers, who's tracking that Alex hasn't been in for 5 weeks?
The system tracks last visit date. 30 days without a visit — automatic push: "Alex, you have €2.50 in bonuses — we're waiting for you!" 23% come back after a message like that. Zero effort — everything's on autopilot.
Why 30 days? Earlier — feels like spam. Later — they've already settled into a new routine. Sweet spot.