Apple's charger already had a standard USB-A port and has moved to having a standard USB-C port.
It's the cable that they include with the iPhone that has a USB connector on the charger end and a lightning port on the phone end.
That included cable allows you to charge with any manufacturer's USB-C charger in the same way that the previous version of the cable worked with any USB-A charging port.
So, in summary, the cable Apple gives you works with other manufacturers chargers, and the charger Apple gives you works with other phones, using a standard USB-C cable that, I would imagine, came with the phone.
If they want to force Apple's hand specifically, they should be focusing on the port on the phone, not the charger.
It's the cable that they include with the iPhone that has a USB connector on the charger end and a lightning port on the phone end.
That included cable allows you to charge with any manufacturer's USB-C charger in the same way that the previous version of the cable worked with any USB-A charging port.
So, in summary, the cable Apple gives you works with other manufacturers chargers, and the charger Apple gives you works with other phones, using a standard USB-C cable that, I would imagine, came with the phone.
If they want to force Apple's hand specifically, they should be focusing on the port on the phone, not the charger.