If they didn't copy the peripheral blocks, then all they did was implement the ARM IP just like ST Micro did in a way to be pin to pin compatible with the STM32

If they didn't copy the peripheral blocks, then all they did was implement the ARM IP just like ST Micro did in a way to be pin to pin compatible with the STM32 chips. Happy to learn otherwise. I wouldn't put them in a real product for many reasons but this is not one of them.