When someone buys a share in Apple, they actually get an ownership share in Apple.
Apple, yes. Google or Facebook, no. Google and Facebook have two classes of stock. The class with all the voting rights is in both cases controlled by the founders. The publicly traded shares cannot outvote them, even if someone bought all of them.
Until recently, multiple classes of stock were prohibited for NYSE-listed companies, which tended to discourage doing this. (The classic exception was Ford, which has two classes of stock, the voting shares controlled by the Ford family. This predates that NYSE rule.)
This matters when the insiders make a big mistake and the stock starts going down. There's no way to kick them out.