but you would have the same level of security as when every single computer on Earth gets automatic windows software update every day from a THRUST worthy address such as Microsoft.com (instead of NorthKorea.com).
Aside whether microsoft can be trusted or not, it introduce single point of failure. History shows Microsoft push few update which broke user's computer, such as update on Windows 10 which cause drive corruption.
Source,
https://www.windowscentral.com/windows-10-bug-can-corrupt-your-hard-drive-just-you-looking-icon-or-folderOtherwise all of Earth's computers would presently be infected by viruses but they are not.
Not all computer uses Windows
The only security breach that I see is when picking random 20,000 (or more) miners into 1 group is to make sure their addresses (IP addresses) are not fake and instead are all coming from one corrupt source such as North Korea....?
You can't fake IP address, but merely hiding your real IP address (usually by using VPN, Tor or proxy).