Seems to be a packaging issue: https://bugs.archlinux.org/task/54570

Have a look at: https://github.com/systemd/systemd/pull/7198

Try this systemd unit file:

    [Unit]
    Description=Privoxy Web Proxy With Advanced Filtering Capabilities   
    After=network.target   
    
    [Service]
    #User=privoxy
    #Type=simple
    #ExecStart=/usr/bin/privoxy --no-daemon /etc/privoxy/config
    #PrivateDevices=yes
    
    Type=forking
    PIDFile=/var/run/privoxy.pid
    ExecStart=/usr/bin/privoxy --pidfile /var/run/privoxy.pid --user privoxy.privoxy /etc/privoxy/config
    ExecStop=/usr/bin/rm /var/run/privoxy.pid
    SuccessExitStatus=15
    StandardOutput=file:/var/log/privoxy/logfile
    StandardError=file:/var/log/privoxy/logfile
    
    [Install]
    WantedBy=multi-user.target

 


  [1]: https://bugs.archlinux.org/task/54570