Board Thread:Naruto Discussions/@comment-33048698-20180726160620

If they don't have permanent usable chakra, this would explain why they travel to worlds cultivated with the god tree so they can convert the fruit of the tree into pills which give them huge but ultimately temporary reserves of chakra.

Eating the fruit raw would give one permanent chakra, but at the cost of your sanity. Why I think this is because kaguya before consuming the fruit was a kind and good person. But after, she turned most of humanity into white zetsu.

My theory is supported by the fact that kaguya was astonished that her sons inherited the ability to generate their own chakra. This caused her to then assume the chakra was hersand they stole it. 