Privacy and defense against cyber attacks is priority one. Use your own raspberry Pi to build up powerful and secure openVPN server. Just connect from anywhere (free wifi hotspot, hotel room etc.) and use advantages of virtual private network (VPN) for free. By using your own openVPN server, Internet browsing stays encrypted and secure.
Sometimes you’re on a network that’s insecure or has an overly restrictive firewall, and you need to access a website. You want to make sure no one in the middle is watching the traffic.
Sometimes it is very useful to find out current top talkers in your network. You can figure out what it’s going on and what IP can be possible source of congestion.