When your site is hosted on a cloud instance, it’s a web app loaded to a server directly, with no intervening control panel items or security. While it’s one of the most stable way’s to host, it does leave you very much at the control of the managed server and security that’s installed there.
By it’s nature, managed hosting works more to secure the overall server, rather than individual hosting instance’s. This means that if ANY of your neighbour’s get infected at any time, then you could too as there’s no protection between your installation and others on that server.
Global Site Guard change’s this paradigm by allowing You as site owner to control all access to your site, no exceptions. NOW you’re protected~