Don’t get me wrong. There are plenty of accessory developers making cases, wallets, car mounts, desk stands, and even magnetic Qi chargers and battery packs that work with MagSafe — but almost no actual MagSafe accessories.
And that’s a big difference because of how Apple has designed the MagSafe standard. Anyone can wirelessly charge an iPhone 12 device using a Qi charger at Apple’s standard rate of 7.5W. Magnets, being a physical phenomenon, are even more universal, meaning that device manufacturers can easily stick an iPhone 12 and a Qi charger together. (Many already have.)