Why does Facebook own your identity and personhood just because they monopolize the social network? Clearly if you don't own your data then these entities will

Why does Facebook own your identity and personhood just because they monopolize the social network? Clearly if you don't own your data then these entities will abuse any intent of law or ethics as long as they can circumvent the law (or you know just come up with a new edge case). The model of letting other entities molest your private data has been tried. It's been a human rights violation from the get go. I don't think we need more propaganda supporting the poor little tech giants. They can come up with a humanistic business model like everyone else. Even if it hurts their profits - idgaf.