So, 36 people (at present, anyway) sign a letter. What in the flying frig is that actually supposed to accomplish? There's nothing really actionable here; you've got the nothingness of "that leadership commit to transparency, clear communication, and real accountability."
Are these people going to actually do anything - quit in protest, sabotage, what? No, they are going to whine, and keep drawing their very lucrative salaries and benefits. Put up or shut up.
Activism takes many forms. They’re not mutually exclusive. Your contribution to this discussion (with a throwaway account) is to put boundaries on what activities you deem acceptable.
You're criticizing a snapshot of a process. I'd agree with your criticisms if we knew this was the end-game, but we don't know that it is. It is not, in general, the correct move to escalate to the maximum level in situations like this, so considered as a process this isn't necessarily a bad thing. The next move is currently Google's.
Why would you start with ultimatums and demands? I think it's better to start soft and get a discussion going. Maybe these people are smart enough to realize that they don't know everything.
Are these people going to actually do anything - quit in protest, sabotage, what? No, they are going to whine, and keep drawing their very lucrative salaries and benefits. Put up or shut up.