These are scams or outdated CloudReady ISOs. Neverware (pre-acquisition) offered ISOs, but those are no longer updated. Using them means:
Choose as the manufacturer and "ChromeOS Flex" as the product. chrome os flex iso
. This is due to its unique partition layout, which doesn't fit the standard ISO format used by other operating systems. Google Help How to Get and Use the Installer These are scams or outdated CloudReady ISOs
Check the official Certified Models list before installing. chrome os flex iso