I think it's on open social apps to show that they're actually meaningfully better products, and that is possible because they're open. With luck, this may lead to an ecosystem where it's worth staying compatible and interoperable, and where users scoff if someone is trying to break it, and where users have an easy way to walk away. I know this sounds super idealistic but this did essentially happen with open source over a long time. At some point, people were just as skeptical of open source as we might be about open social.