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.
You could go to 4chan for this feature…
Personally, I like author names on comments and posts. Also allows me to block trolls so I don’t see their troll comments anywhere.