OpenVPN connects but does not allow traffic

First of all, 10.91.0.1 is a private IP address, there is no way to reach it from the internet. Secondly, being able to connect through Privoxy and Tor Socks over the internet is a security issue, not a a feauture. The Privoxy part has been fixed and disabled in realease 22.16.

Rather, in your ovpn config file you should try to substitute the private IP with your domain name.