I will suggest to remove the iptables rules form the code, they are inside a loop and that’s not a good practice, better run them manually.
So first flush iptables:
iptables –table nat –flush
iptables –table nat –delete-chain
iptables -P FORWARD ACCEPT
Enable port forwarding
echo 1 > /proc/sys/net/ipv4/ip_forward
Then run the iptables manually and try it again, and yes, it looks like speedbit.com is offline now, that’s weird. So you can try with stealmylogin.com
Are you sure you are using the latest custom kali image provided by Zaid? It’s important! Are you using python 2 or 3?
Let me know.