I've replied in a thread, and what I've replied to above was about the enterprise tax and that it's surely cheaper to do your own, not if the original article is about enterprise or not.

I read the thread. What you replied to was this,

> > an IB switch is in the same ballpark as an ethernet switch with the same port speed

> And both price tags will make Elon's "someone's scamming me with a 'you're an enterprise customer' surcharge" sense tingle.

In the context of Tesla doing their own protocol and not-high-end NICs.

If you were starting a team from scratch this is surely true. But, if you can leverage existing teams and infrastructure, it’s very possible.