One hand washes the other: they buy ads from Google (I think), so Google prefers them in the indexing process, so they get more traffic, so Google prefers them even more.

It depends on which part. It is certainly heading down the same route as Wikipedia with all the problems that entails. You're usually better off on a smaller Fandom wiki as it won't have beeb taken over yet.

The James Bond wiki is particularly bad, but Memory Alpha seems to be better run.