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Re:Fake WhatsApp update from “WhatsApp Inc.” with Unicode wh... by nolok on Saturday November 04, 2017 @05:58PM (#15627119)
They don't. More exactly, they try to vet things, after the fact, and not covering anything. Source : their own faq.
Re:Fake WhatsApp update from “WhatsApp Inc.” with Unicode wh... by disconnected on Saturday November 04, 2017 @06:30PM (#15627219)
I skimmed their docs and I don't see any sort of language that corroborates what you are claiming.

They DO seem to have some sort of review process in place:

https://f-droid.org/en/docs/Inclusion_How-To/

See: Application Review Process.

I don't know how exhaustive it is or how effective it is in practice though.

Re:Fake WhatsApp update from “WhatsApp Inc.” with Unicode wh... by Sylos on Sunday November 05, 2017 @12:53AM (#15628212)
They don't do a thorough code review, but they are human beings and they manually build the software from its code repository, so they will notice these kind of discrepancies.