>Generally acronyms and initialisms are capitalized, e.g., "NASA" or "SOS." Sometimes a minor word such as a preposition is not within the acronym, such as "WoW" for "World of Warcraft". In British English, only the initial letter of an acronym is capitalized if the acronym is read as a word, e.g., "Unesco."
I've always said ARM (as in each individual letter) when talking about ARM processors and it's never even occured to me to pronounce it like Arm.
That being said... I do pronounce RISCV as /rɪsk-viː/ (or, as I believe was the intention rɪsk-faiv depending who I am talking to) and that seemed entirely normal as opposed to pronouncing each letter in the Acronym...
So maybe I'm just weird here...
Since RISC-V is longer I pronounced it the same as you; /rɪsk-viː/, the same as to NASA and NATO.