"Software VPN" such as OpenVPN has two main use cases fighting each other. The usage you mention is the roadwarrior, where the physical network is untrusted an

"Software VPN" such as OpenVPN has two main use cases fighting each other. The usage you mention is the roadwarrior, where the physical network is untrusted and you want to route all traffic through the server. This is what commercial VPN providers provide. The other use case is routing a set of domains though the tunnel, since the local network is trusted. This is useful when you are at home with your personal computer and want to access the work's LAN, but still want YouTube or large traffic to keep going through the local network. Since you are not exclusively bound to an uplink, you can have multiple VPN of this type connected that "expose" different sets of domains. This is possible if you dig through docs, since everyone and their mother are trying to do the other kind.