Boruto novel of the movie proves that Momoshiki and Kinshiki were part of threat kaguya was afraid of.
The generaly she was afraid of all Chakra thieves which in general were all remaining Ootsutsuki who were living in Kaguya's dimenssions. Also the greatest and funny fact is that There were supposed to be more Ootsutsuki in Kaguya's dimenssion while Naruto and Sasuke fought Kaguya but Kishi rushed it and decided to change it for time being.
In general Kaguya was afraid of all living Ootsutsuki who were chakra thieves according to her and potential threat.
It seems Most of Ootsutsuki were power- greedy/hungry so only God Hagoromo escaped that terrible curse.
The one and only humble God - JJ Hagoromo Ootsutsuki
