alt Hacker NewsGraviton CPUs are just Neoverse cores (V3 in this case). While it’s true that you can’t just buy a box with the same cores, the cores are basically the same as what you’ll get on a Google or Azure cloud instance (eventually… the latter two have yet to make available anything with Neoverse V3 yet).
Strangely the first-generation Graviton chips have actually shown up in MikroTik hardware that you can just buy. Amazon must be selling off their stock to third parties once it's phased out of use at AWS, but I doubt they'll ever sell the stuff they're still using.