Another use case is if you are for example at university or something like this, where a lot of people could connect to the same network as you. The network is relatively safe, but could have someone sniffing the traffic. You could then setup a router at the edge router of the uni (if you can access it wink wink). Then you could secure the connection internally to your PC.
Some universities block torrents and other links as well, they have DNS filtering, so you would bypass those systems. They are usually internally somewhere in the network, not at the edge router.
So that could be a use case in an internal network
However, the best thing in that case is to just have a VPN server at home, and tunnel all the way out.