Basically like Tor, some VPNs route someone else's VPN connection through your VPN client. If I want an IP address in Sweden and someone in Sweden wants a US ad

Basically like Tor, some VPNs route someone else's VPN connection through your VPN client. If I want an IP address in Sweden and someone in Sweden wants a US address some VPN companies would just route our traffic through each other's home addresses (potentially leaving you on the hook for what the other user was doing).