Lemmy admin should add option in the account settings for hiding your username from your posts/comments, and hiding your profile from the public, so noone would be able to see all of your posts in your profile page, and even if someone is using a tool for scrapping posts, they wouldn’t be able to link the posts to 1 user, because the username would be greyed out “anonymous” (and would not link to anywhere). Only lemmy staff would know the real username.
If someone can identify you through your lemmy username an admin isn’t going to save you from your terrible opsec practices.
Lemmy is a social media service. Act accordingly.
I edited my post, check it out.