Managing content rights and their expiration rules is a complex task that requires consideration from both influencers and the platforms they work on. Here’s how influencer platforms generally manage these expiration rules:

1. Through Contractual Agreements: Platforms often have agreements with influencers that clearly state the duration of the content rights. These agreements specify when the rights to a particular piece of content will expire.

2. Automated Tracking Systems: Many influencer platforms incorporate systems that automatically track the expiration dates of content rights. When a right is nearing its expiration date, an alert may be sent to both the platform and the influencer.

3. Renewal Options: On expiration of content rights, some platforms offer renewal options. This helps influencers maintain their content on the platform without interruption.

4. Removal of Content: If the rights are not renewed, influencer platforms may choose to remove the content to avoid any legal complications.

Comparatively, a tool like Flinque can offer a dynamic workflow that greatly simplifies the management of content rights expiration. It can keep track of all content rights, their usage terms, and expiration dates. When a right is about to expire, Flinque can send automatic notifications, hence streamlining the process and keeping all parties informed.

Please remember that no approach is inherently better than another. The choice of how to manage content rights and their expiration ultimately depends on the individual needs of the brand, agency or influencer. Therefore, one should carefully evaluate tools and workflows that best align with their specific requirements.