The way USB-C is supposed to work is the charger, device, and the cable itself have smarts in them, and they all negotiate taking into account the kind of power the device accepts, the kind of power the charger can provide, and the kind of power the cable can deliver to properly charge the device.
More than likely those devices you have don’t have any smarts in them and just want 5V with 500mA or perhaps 1A delivered to its USB-C shaped plug. Since it’s dumb port, the USB-C chargers can’t talk to it, and therefore they refuse to provide power. However, most USB-A chargers are just dumb power supplies and will happily provide the 5V 1A (or 500mA) the device wants. Technically a USB-A device shouldn’t draw more than 100mA of power without getting an OK from the port it’s plugged into, but that’s been mostly ignored for years now.
The way USB-C is supposed to work is the charger, device, and the cable itself have smarts in them, and they all negotiate taking into account the kind of power the device accepts, the kind of power the charger can provide, and the kind of power the cable can deliver to properly charge the device.
More than likely those devices you have don’t have any smarts in them and just want 5V with 500mA or perhaps 1A delivered to its USB-C shaped plug. Since it’s dumb port, the USB-C chargers can’t talk to it, and therefore they refuse to provide power. However, most USB-A chargers are just dumb power supplies and will happily provide the 5V 1A (or 500mA) the device wants. Technically a USB-A device shouldn’t draw more than 100mA of power without getting an OK from the port it’s plugged into, but that’s been mostly ignored for years now.