What is the reason for creating a new account with a "private email address"?

[Arnis Riškovs]

Hi,
The user (employee) Māra Kalve (icon MK) was created yesterday by logging into the client portal using the email address mara.kalve@lnkc.gov.lv (the email address in the client list is “private email address”).

In the client list, you can see 2 more client records that were created earlier and refer to this employee, one of which is also mara.kalve@lnkc.gov.lv. She also logged into the client portal with this email address before (3 times out of 10; the other tickets were created in an anonymous session).

Also, as the user "Māra Kalve" (icon MK), she receives notifications by email mara.kalve@lnkc.gov.lv . If she uses the client portal for a comment in a ticket, everything is OK. But if the comment is submitted as a reply to a message received in an email, the comment begins with "mara.kalve@lnkc.gov.lv (not a request participant)". This negatively affects the operation of the automation that responds to the client's response.
What is the reason for creating a new account with a "private email address" if a client with such an email address (mara.kalve@lnkc.gov.lv) already exists and how to prevent clients with a "private email address" from being created?

[Marc -Devoteam-]

Hi @Arnis Riškovs 

This is an action done by the owner of the account.

"Private Email Address" label appears on a customer profile and related work items,  because the user has set their Atlassian account privacy settings to hide their email.

Only site  or org administrators can view actual user emails via administration tools.

[Brandon Viertel]

Morning @Arnis Riškovs 

 @Marc -Devoteam-'s answer is right on. The only thing I would add is there are no controls to prevent that, even at the org level. 

Cheers,

Brandon