You mistook "free and accessible" with "public". You may exercise freedom of speech but not on server that belongs to a private company - it is their right to

You mistook "free and accessible" with "public". You may exercise freedom of speech but not on server that belongs to a private company - it is their right to limit what kind of content they like. But in an essence you are right - companies should exist to benefit society, but it is not how it exactly works right now.