: Always install new extensions in a "sandbox" or development environment before moving them to your live store.
This is the biggest danger. Most nulled extensions aren't shared out of the kindness of someone's heart; they are often "backdoored." Hackers inject malicious code into the extension to: Magento 2 Nulled Extensions
If your budget is tight, it is much safer to use from the Magento Marketplace or GitHub. A $100–$300 "savings" on a nulled extension isn't worth the thousands of dollars you'll spend cleaning up a hacked site or the loss of customer trust. : Always install new extensions in a "sandbox"