I have limited knowledge on these things; FD: I work for Ubisoft in their Massive Studio.
Ubisoft itself is incredibly silo'd; each studio and each function operates like a loosely coupled bundling of companies.
You can think of it like:
* Marketing has offices (or colo's in some offices) but has a completely seperate reporting structure all the way to Yves.
* (same for other business functions such as server hosting, exchange administration etc;)
* Studios operate with an entirely different culture from HQ.
* Studios develop games, those games are submitted for "stage gates" which is when Editoriale can say if something is fun, or if something needs to be cut or added.. Editoriale in HQ can only speak during those times (big milestones). Otherwise the Studio doesn't really talk to HQ. (save: marketing, I guess)
I can say that Massive is incredibly progressive, this isn't just a result of being Sweden, even some (not all) of the Swedes who work here think we're overcorrecting for progressiveness. We had Sarkeesian on site a few times to consult on games (and paid her handsomely for the privilege)
However.. and this is a big however:
There is also a culture of partying in the upper echelons, self-promotion, congratulatory/promotional incest and an "untouchable ego" that a lot of the upper management seem to have, this means that people at the top stay there, enrich themselves and keep others out. This doesn't apply to Yves himself, strangely, I've met him many times and is a fantastically humble, down to earth and generous guy. In fact he's made many moves that are directly against enriching himself in order to ensure that nobody can get the idea of shuttering a studio and putting people out of a job- and has actively worked (personally) against crunch culture.
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What I'm trying to say is that: each "head" is responsible for the culture they create; and some people are given the freedom to abuse that culture.
Yves see's that ability to abuse as a failure of HR and that's why (I speculate) that Cecile has been let go.
As far as I understand Serge has had no allegations levied against him; however it's unconscionable how much power he had- and it would have been easy to abuse accidentally (an off-hand comment/joke being taken as an instruction). Not saying he's not guilty of anything but that kind of power should not have been levied.
Notably the Editoriale team (gatekeepers for games) was recently expanded to be more diverse.. that diversity was all middle-aged white french guys who came from the same school and had worked in that department before.. so.. not very diverse.