Slapping a random name on a cheap product from the Yiwu market[1] is far quicker and easier than building a brand. There are a lot of Chinese middlemen who have the skills to ship boxes profitably, but don't yet have the skills to establish a brand name in the Western market. Dollar stores and big-box retailers are full of cheap no-name products of indifferent quality, because there's a sustained market demand for literally the cheapest option.

Chinese manufacturers and retailers are moving up the value chain as fast as they can, but it's not an overnight process and no-brand goods aren't going away.

[1] https://www.youtube.com/watch?v=RDd10-poMm8