Google doesn't use shared building wifi in their corporate campuses
> For both wired and wireless access, Google uses RADIUS servers to assign devices to an appropriate network, based on 802.1x authentication. We use dynamic, rather than static, VLAN assignment. This approach means that rather than relying on the switch/port static configuration, we use the RADIUS servers to inform the switch of the appropriate VLAN assignment for the authenticated device. Managed devices provide their certificate as part of this 802.1x handshake and are assigned to the unprivileged network, while unrecognized and unmanaged devices on the corporate network are assigned to a remediation or guest network. - https://static.googleusercontent.com/media/research.google.c...
Yes BeyondCorp does allow access to corporate resources outside of the intranet, but as part of a managed device + identity + network evaluation.
