The fediverse is different than online social media. You have one server who has the data yes, but you are essentially blasting out all of your opinions across the entirety of the fediverse, where anyone or any entity can have a listener. There are no deletes either, meaning that whoever is listening does not have obey the delete request.
We have our open world free from takedowns and corporate, but the tradeoff is privacy. Expect anyone to be listening