Car seats, cots, carriers, bottles. Today a parent only hears about it if they mailed back a registration card or happen to see the notice. This business is a subscription where parents log the exact products they own, down to model and lot number where it matters, and get an alert the moment any of them is recalled. Maker registration and government recall sites both wait for the parent to go and check. This pushes the warning to them instead. Families pay a flat yearly fee.
Accuracy is everything, because a missed alert about a car seat is exactly what they paid to avoid.