Why aren't the likes of Dell & HP competing in the Threadripper space?

[Quartz]

I find it interesting that the top tier of PC manufacturers simply aren't competing in this space. I expect the likes of OCUK are making money hand over fist.

There must be a reason.

 

[Quartz]

Dell & HP both sell Epyc servers, so I'm a little bit skeptical about the Intel payoff line.