deleted.

I don't know what happened but, apart for the Pico, Raspberry Pi no longer exists since it's generally unavailable.

Edit: The Pis, both standard and zero, are effectively Broadcom chips demo boards so perhaps the issue is with Broadcom... Pi Picos, which are based on an in-house chip AFAIK, seems to be available without too many problems.

As a side comment, I still find it surprising that no company has been able to exactly clone the Raspberry Pi.

The entire PC industry was built on cloning other machines and architectures. Why is it seemingly impossible to so perfectly clone the Raspberry Pi that all RPi software would work seamlessly?