The unfortunate thing about the Fediverse, relative to a (hypothetical) walled garden, is that this sort of information leaking is inevitable.<p>Meta has the scale and scope to make it scary, but the point of the Fediverse is that it is federated, which implies some openness. If you're federated, you are publishing content to other people that they might do whatever they want with. That includes crawling it, storing it, indexing it, and building mass profiles. You can certainly protect yourself by blocking bad actors, but since the network is, well, a network, an aggressor that <i>wants</i> your published data need only find access to a node you <i>do</i> want to share with and copy from there.<p>So you either default-close your data and choose very, very carefully who you federate your node to or... You don't put that data in the fediverse at all.<p>(Contrasting to a walled garden, where monolithic control of the data storage and transfer means a single entity is responsible for where the data goes and can constrain at will. If someone's kicked off Facebook, they're <i>off</i> Facebook; they have a single attack surface they have to reenter to get to that data, not O(nodes) they could make an account on to reach the data of someone who'd rather not share it with them).