Not only have there been major bugs with delete of comments not working on other servers, the whole idea of federation is that it gets sent out to any instance that wants a copy - with not even a ‘terms of service’ that is standard on Lemmy.
For such a communist focus that the Lemmy developers have, I’ts so odd that they don’t emphasize that content is public and have it like Wikipedia content contributions. They use GPL license to force people to share their work of the code, but then they turn around and promise privacy that they fail to deliver on given that they don’t even warn newcomers how federation works.