All your posts on the fediverse are effectively a public blog of your thoughts that will be scraped and stored in servers you have no control over.

If you care about privacy, which I understand, you probably want to leave quickly.

Here’s a rundown from someone who got fed up with the fediverse and kinda rage quit: https://blog.bloonface.com/2023/07/04/the-fediverse-is-a-privacy-nightmare/

Another example of this is that it’s not just about lemmy. One way in which lemmy actually federated well worth microblogs like mastodon is that users can be followed from mastodon etc.

So any number of servers running a number of open source easy to run platforms could be taking up everything you specifically post.