There is some confusion about who should implement a CMP.

To clarify this, it is necessary to know what user data is being collected and how it is being used.

CMPs can be used in a variety of contexts, including publishers, advertisers, and ecommerce websites.

Some examples and use cases include:

Publishers: should use CMPs to obtain user consent for the use of cookies and other tracking technologies on their websites. This allows publishers to comply with privacy regulations and demonstrate their commitment to protecting user privacy, which can help build trust with their audiences. By implementing a CMP, publishers can provide a transparent and user-friendly experience for obtaining and managing consent, which can ultimately lead to better user engagement and satisfaction.
Advertisers: CMPs can also be used by advertisers to obtain user consent for data processing activities. Advertisers may use CMPs to group users by categories or purposes for targeted advertising, while ensuring that they have obtained user consent for such processing.
Ecommerce: CMPs are used by ecommerce websites to obtain user consent for data processing activities related to their online shopping experience. This can include consent for retargeting ads or using user data for personalization purposes.

In summary, a CMP is a valuable tool for companies seeking to comply with privacy regulations and build trust with their audiences. By providing a clear and transparent mechanism for obtaining user consent, CMPs can help companies ensure that they are processing user data in a responsible and ethical way.