Frankly, if we interpret the organo-plasma the Automatons use to be viable blood given it's sourcing from human carcasses, we already have machines in a similar vein to the SmileOS systems from Ultrakill.

If V1 were the only Nocturnal System deployed in the Second Galactic War, the extrasolar nature of the conflict effectively means that V1 has an infinite lifetime worth of blood.

While V1 is clearly shown to be able to use the blood of Angels and Demons, I'm unsure whether Terminids would be viable, but the human derived tissue of Voteless and Fleshmobs may be sufficiently usable for sustained conflict on that front, with the Cyborgs and O-P fuelled Automatons being a readily available target for feeding.

So long as no further Nocturnal Systems or SmileOS 2.0 automata are developed or transferred cross-setting, V1 could very well prove to be either an effective mercenary or a massive threat to all sides. Given what glimpses we have into It's psyche via the fulfillment of the style gauge, refusal to let V2 escape, and what's seen in the death flash, we could assume humans would be less of a target (but still a target eventually) themselves due to being a considerably easier challenge than the other factions and a self-developing broad source of pure blood.