Thank you for reaching out. This morning, we published a new blog post about personal settings and privacy.
The short part I'll draw your attention to is this:
By default, nickname, or user name, appears whenever you post or send private messages. This allows members who wish to not be identified by their real name to choose a community nickname and help them feel more comfortable participating.
Showing the nickname by a member's post is a common practice on communities. That being said, I understand your desire to change the nickname and will reach out to you via private message to discuss this further.
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