Why ORDS_METADATA user does not have expiry date

I noticed that the user ORDS_METADATA does not have. I know this user it comes with ORDS which we are using, but why no expiry date?

SQL> SELECT username, profile, account_status, expiry_date FROM dba_users WHERE username = 'ORDS_METADATA';

USERNAME PROFILE ACCOUNT_STATUS EXPIRY_DATE
—————- ———— ————————— ——————
ORDS_METADATA DEFAULT OPEN

SQL> SELECT limit FROM dba_profiles WHERE profile = 'DEFAULT' and resource_name='PASSWORD_LIFE_TIME';

LIMIT
——-
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