Why did pirates rob ships during the period of Jiaqing in the Qing Dynasty, which issued a sea ban?

Why did pirates rob ships during the period of Jiaqing in the Qing Dynasty, which issued a sea ban?
The maritime disasters in Guangdong were endless in the Qing Dynasty.

since the opening of new shipping routes in the 15th century, the world has entered an era of great colonization, great navigation, and great trade. The huge ships in the vast sea chopped up the waves in search of wealth. As a result, pirates have sprung up, and all kinds of pirates who plunder privately, "public" and "public-private" haunt every corner of the five oceans, leaving behind legends.

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