Mail to Mail @ Ru behaves so conveniently that it’s scary

The mail service and the Us @ Mail @ Ru team have created a service that is so convenient that sometimes it becomes scary.
For example, we will conduct an experiment.

Step 1
We start a new mailbox on Yandex:



Step 2
Go to the Mail @ Ru service and in the login and password field we specify the login and password from the Yandex mailbox that was just started and press the Enter key:
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Step 3
This step may not be, but since I did not have an email address at Mail @ Ru, the service offers to be presented to the system:



Step 4
We use the postal service:



Is done. No need to go into the settings, link mailboxes and perform other complex manipulations for the common man. Sometimes people do not even know about this possibility, how to use one mailbox, and collect mail from various services.

I seriously believe that in terms of user convenience - this is an excellent solution! There is no interface, and the functionality is executed.

However, when you start thinking about privacy, security and ethical behavior in the market, such a decision no longer looks so acceptable. You can at least warn the person what is happening.

UPD.: As evilbot suggests, I am not the first to find a convenient service; the link is a response from Mail @ Ru.