migs_k

This thread ended with the issue being related to Eset LiveGrid connectivity. Check your Eset Event log for any entries realted to this status.

You have this setting probably enabled, it's disabled by default:

You can either disable it or disregard the notification.

Yes, the site is legit. My.eset.com uses a different account to log in.

Win 10 version upgrade logs.
 
Every Win 10 installation has the same unknown user.

some of them might be located in the "view optional updates" section in Windows Update settings panel.
in my case it shows Microsoft Silverlight ready to download but it doesn't appear in Windows Update. Silverlight is obsolete now and unnecessary now.
i suspect that Eset pulls info from the Microsoft Catalog website and displays them. if you click "Check for Updates" in the Windows Update and it shows your device is up to date, then don't worry.
 

As far as KB4023057 goes, I also received it again on 2/19. Appears this is an update to Windows Updating itself and Microsoft is just using the prior KB number.

All those services are fine, they are just Windows 10 Per-user services:
Per-user services in Windows 10 and Windows Server - Windows Application Management | Microsoft Docs

Yes, every user session the services will be created with a different hex number suffix.