That's a problem to be solved.

1. Rewards

Online marketplaces offer discounts & rewards to customers. This builds reputation for the marketplaces, but not for the individual brands.

2. Choices

Online marketplaces provide multiple choices to customers. This ensures sustenance of the marketplaces, but not of the individual brands.

3. Experiences

Online marketplaces deliver innovative customer experiences. This retains customers to the marketplaces, but not to the individual brands.