For the former, it's none of the things you say, and AFAICT, you have precisely zero knowledge of either the decision making process, or how it is used, etc.
So saying "it's quite obviously x" seems trivially wrong.
No one in this chain said that, however. Some person gave an opinion and you then replied with "you don't have any knowledge on this". Even though in this case, it is indeed a cultural question which everyone has some knowledge and likely opinion on.
If you want to encourage others to seek more information out (if it's out there), then sure. But at some point it just sounds like you're appealing to an authority that doesn't exist here. And honestly, who IS the authority of a thing like language and its usage is a conversation in and of itself.
It's quite obviously not a carefully thought through decision, it's more or less random machine-gunning of random words that happen to have the word mother in them because ... well ... because they think motherhood is offensive? Presumably? It's impossible to discern any logic here. This supposedly expert decision is already leading to near universal derision towards Google, a once universally respected name. That derision is now also coming from left-wing media outlets that you'd expect to be fully supportive, like VICE. That's because it's quite obviously insane. Nobody is looking at this and thinking "about time", they're thinking "wtf is that?!".