Since nulled versions don't receive official security patches, your billing system becomes an easy target for hackers. A single data breach can lead to legal liabilities and the total loss of customer trust.

This leaves your installation a "sitting duck," running outdated, unpatched software. Automated bots constantly scan the internet for such vulnerable targets. By using a nulled version, you are not only rejecting future updates but actively keeping your server in a permanently compromised state, vulnerable to every known exploit.