Why in some Dribble UI’s User Avatar (user settings) are kept in bottom left?

Just curious, I saw in some of the dribble shots are designed with the User Avatar in the bottom left of the screens and also noticed on BitBucket UI.

reference from: https://community.atlassian.com/t5/Bitbucket-questions/remote-Too-many-invalid-password-attempts-Log-in-at-https-id/qaq-p/1108614

Is there any usability factor for keeping it at Bottom Left?

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