What is the primary constraint when using behavioral targeting in X Ads?

The primary constraint when using behavioral targeting in X Ads is the accuracy and reliability of the data used to infer user behaviors and interests. 'Behavioral targeting' involves targeting users based on their observed online activities, such as the apps they use or the websites they visit. However, the data used to infer these behaviors is often collected from third-party sources and may not always be accurate or up-to-date. This can lead to targeting users who are not actually interested in your product or service, resulting in wasted ad spend and low conversion rates. For example, a user might be categorized as interested in 'travel' based on a single visit to a travel website, even if they were just researching for a school project. The accuracy and relevance of behavioral targeting depend heavily on the quality and completeness of the underlying data, which is often limited and imperfect.