[conk]

It’s a classic make vs buy decision. What base platform is offered by GM/Toyota/Kia/etc?

There are some examples where car makers (both EV and ICE) will sell components to competitors but in general this is pretty rare. Most companies want to control key aspects of their supply chain.

Rivian did use motors from Bosch but is now in the process of using their own internally designed motors. This allows them to build exactly what they need and avoid relying on Bosch for a key component of their vehicles.