> However, I always thought the DYBOOPs and BIPLOZAs of this world existed on Amazon because of a glut of Chinese manufacturing expertise outpacing any ability to do proper branding and marketing.

IIRC, if you have a "brand name" it unlocks some desirable features in the Amazon Seller experience.

The DYBOOPs and BIPLOZAs are almost always just heavily marked-up items you can buy on AliExpress much cheaper if you're willing to wait a week or two.