AMD has had their own version of this for quite some time. Its called the Platform Security Processor (PSP), it has been in anything AMD since around 2013 [0]. I am not sure if Ryzen / Threadripper has it, but I would be surprised if it didn't.
If I'm not mistaken, PSP is not at all like ME, it runs code if you supply it with such but on it's own it doesn't listen to network traffic or run it's own OS, atleast, last I checked.
I'd still consider AMD the better player in the game.
[0] https://libreboot.org/faq.html#amd-platform-security-process...