Because they live in the same places. They go to the same restaurants, they have the same conversations, they have personal friends at FAANG... they live and breath the same ideas, the same opinions, the same perspectives. They are in a bubble, and think "their" org should partake in the same behaviours as all the other companies out there - if anything, because it will be useful for their CVs when they inevitably look for a new job next month or next year. I don't blame them, it's inevitable human behaviour.
Maybe Mozilla should relocate the bulk of their leadership outside the US.
They don't even have to leave the state. Just don't be stuck in that same stagnant SV bubble and bring in people with genuine ideas and initiative.
Wolves see the community sheep build and then move in under wool coating. Doesn't mean they still are not in fact a wolf.
I don't think it's malevolence from the mozilla leadership team but more that if you hang around people who have bet their lifesaving on the success of cloud based LLMs, being cautious and making their use "optional" might begin to sound like a really controversial position even if that's actually what the users/community want from Mozilla.
Firefox market share have been declining and it's not easy to point to any obvious technical problem, so the reason for the decline is likely that the Mozilla corporation keep messing up the narrative by acting like just another Silicon Valley tech firm.