It's not the same as a bank. Google is far far ahead of that. HN seems to have pitch forks for anything Google. It's the only company that let's you openly engage with the CEO and hold them accountable.
Of course it does have to do with the topic. I can know the CEOs number in a 10 person startup. And the number isn't the point, the point is having an official unscripted channel to voice concerns.
This isn't that unusual. Being able to text the mobile of the CEO of tech companies with 10k employees -- and get quickly get a response -- is something I've used more than once. Not every big company is like this but I suspect it is more common than you might expect. At least in tech, this is an expectation of the role.