That's not quite true tho is it? FB does offer something it represents as being a platform. And bear in mind that he didn't just blindly build a product assum

That's not quite true tho is it? FB does offer something it represents as being a platform. And bear in mind that he didn't just blindly build a product assuming that he could trust the platform. He solicited and continually received assurances that his product would be welcomed and valued on the platform. It was only after he had invested time and money building it that the rules changed. And it was that experience that resulted in his conviction of the need for a competing product.