A dumb but serious question: what powers does a board of directors have? In terms of day to day operations, engineering, product, marketing and so on?
They have ultimate power over everything. They could ban my favourite subreddit tomorrow if they wanted. In practice however, they hire a CEO to handle all that for them and don't get involved unless things get so out of hand that they feel their CEO is steering the ship wrong. At this point they tell the CEO what outcomes they expect, and if he can't or won't comply, he gets replaced.
No well-functioning board would act like that. Sure, they can pressure the CEO to take particular action when the company is under pressure, but normally, that kind of micromanaging by the board would be a sign of serious dysfunction.
They are there to represent the shareholders, appoint the executives, and to ensure the company is being managed well, including complying with laws and adhering to relevant societal expectations.