The year 2022 marks 15 years since the entry into force of the United Nations Educational, Scientific and Cultural Organization’s 2005 Convention on the Protection and Promotion of the Diversity of Cultural Expressions. Among its objectives, this treaty aims at acknowledging the specific nature – economic and cultural – of cultural activities, goods, and services, reaffirming the sovereign right of states to adopt or implement measures they deem appropriate for the protection and the promotion of the diversity of cultural expressions as well as reinforcing international cooperation for more balanced cultural exchanges. Since its adoption, this treaty has been criticized for its low level of constraint. However, data collected over the years show that parties rely extensively on the Convention to undertake diverse initiatives to achieve the treaty’s objectives. Based on concrete examples, this article aims to show that the effectivity of a legal instrument does not only rely on its degree of constraint but also on other factors, including monitoring mechanisms put in place in the context of its implementation.