The book brands you listed are not of the same nature. Some are subordinate departments of the publishing house, some are subsidiaries funded by the publishing house, some are joint ventures between the publishing house and foreign funds, and some are non-publishing private enterprises (or writing studios) that have business cooperation with the publishing house. A brand in this sense is actually just a name. More often, the first is the name of a department or institution, and the brand is only its appendage. In this sense, its classification can also be classified from many different angles, such as the relationship with publishing houses listed above, or according to the direction of major books, but because comprehensive publishing is the mainstream at present, the previous classification is more real. There are national, local, well-known and unknown organizations, which can be called brands, and there are also organizations with 150-200 (roughly estimated).