I think its supposed to be more like, the builders sent the protomolecule to terraform any planets with life. They are the filter. Earth escaped because the protomolecule unexpectedly was trapped by Phoebe. I am not sure the builders are hiding so much as paving over everyone else.
this post was submitted on 01 Oct 2023
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I think the protomolecule was sent on Phoebe and got trapped by Saturn