This add-on removes (unlink) username link and avatar link on various forum locations based on user group permissions.
remove (unlink) username link and avatar link
set permissions for user groups
locations where username link and avatar link is removed:
Linked Accounts allows your members to link one or more accounts then quickly switch between them. You have permission to decide which user group can use the system. The Post as feature allows the user with linked accounts to create to a thread using a Linked Account.