The All_Internet object is just a simple network address range containing all IPv4 addresses (public and private) per default. From my point of view this is not ideal for using it within a security policy to address the public Internet, which doesn't route private networks.
I suppose it may supersede the Global Properties definition for Non Unique IP Addresses making proper Policy Verification checks harder. However, from my perspective even *Any is not ideal to address the Internet within a security policy because it means Any network, even private ones, all VPNs, Office Mode and everything.
That's why I created a dedicated topic for:
https://community.checkpoint.com/message/10464