silverstripe-blog/docs/en/configuring-user-profiles.md

Configuring user profiles

This module ships with User Profiles enabled by default.

If you'd prefer to disable this functionality and instead return a 404 for the /profile/ page, you can do so using SilverStripe config.

In mysite/_config/settings.yml

SilverStripe\Blog\Model\BlogController:
  disable_profiles: true