Yes. This works because AdGuard is installed on your Mac and adds itself to the trusted authorities there. Basically computers with adguard installed will trust the certificate while computers without AdGuard installed will not trust it.
Some companies do something similar (like another commenter here mentioned), where they install their own certificate on all work provided devices, allowing them to man-in-the-middle all connections. Personal devices without the company certificate installed will then just show the certificate error.
Yes. This works because AdGuard is installed on your Mac and adds itself to the trusted authorities there. Basically computers with adguard installed will trust the certificate while computers without AdGuard installed will not trust it.
Some companies do something similar (like another commenter here mentioned), where they install their own certificate on all work provided devices, allowing them to man-in-the-middle all connections. Personal devices without the company certificate installed will then just show the certificate error.