There is a working assumption that if something you own is recalled, you will be told. Occasionally that is true — if you bought it new, mailed in the registration card, and have not moved since. Most of the time, none of those hold.
The chain has several breaks in it
Second-hand goods carry no registration. Gifts and hand-me-downs carry none either. Cars change hands and the letter follows the previous owner. Cribs, car seats, and strollers are the most-passed-on category of goods there is, and also among the most-recalled.
Meanwhile the data is public. NHTSA publishes vehicle recalls and the CPSC publishes consumer-product recalls, continuously and in the open. The information exists; the delivery does not.
Which makes it a matching problem
If you know what you own — the car by its VIN, the appliance by its model number — checking that against a published feed is mechanical. The hard part was never the checking. It was that nobody had a list of what the household owns.
A recall you never hear about is indistinguishable from a product that was fine.