Isn't enough that some of our rubbish at some far time land finally in some place where aminoacids form byself already et voila ? (they call themselves Eaerthians, too..)
Once was enough.
It existed long enough only to - after exhausting study - re-engineer its own formula according to conditions and laws of ethernity and choosed the best - small fractal twist of a carbon based spiral was the minimal requirement supporting all the casess of: in minimal conditions being emergent, viral and unstoppable. Eternal.
Life.. may be common in space, uncommon in time.
(AI, as we know it, is dead not inert; as we don't know it, may be part ot that fractal twist..)