> Ampere has been on NVidia's roadmap for the better part of a decade.

Not publicly, at least, since rumors of the "Ampere" naming surfaced around late 2017. https://www.kitguru.net/components/graphic-cards/matthew-wil...

Ah, I thought I remembered seeing the name on their roadmap earlier than that, but I must have been mistaken. In any case I think it's safe to say the name wasn't ripped off anyone give the names of pervious products and the timing of those rumors.