ALL of those devices are based on the same RTL8196C Realtek SoC. This is one stupid/corrupted/incompetent Realtek employee/contractor putting a backdoor in SDK reference codebase (access under NDA, Realtek is famous for being hostile towards opensource just like Broadcom), and no one else bothering to even read sources before shipping devices.
Realtek is famous for being hostile towards opensource just like Broadcom
On the other hand, you can easily find datasheets for many of their SoCs. Whether or not this is due to their lax security policies is a question to consider too...
Realtek might not be agreeable to opensource, but I'd say they are still a far distance away from Broadcom. They are more of a "Gongkai"[1] sort of company.
Doesn't gongkai imply that someone simply "stole" their datasheets and circulated them? I.e. they are available, but not because the company itself wanted it that way.
they dont
ALL of those devices are based on the same RTL8196C Realtek SoC. This is one stupid/corrupted/incompetent Realtek employee/contractor putting a backdoor in SDK reference codebase (access under NDA, Realtek is famous for being hostile towards opensource just like Broadcom), and no one else bothering to even read sources before shipping devices.