From a trademark perspective, the OTW has not heavily policed the use of "AO3" in mirror names, primarily because most mirrors are non-commercial. However, using "exclusive" implies a partnership with the OTW, which does not exist.
Unofficial mirrors and personal archives ensure that decades of fan labor are never truly lost if AO3 experiences a catastrophic server failure or shuts down. ao3 mirror exclusive
AO3 is valued for its robust tagging and search engine. When you hide chapters on a mirror site exclusively, you break the discovery chain. A reader searching for "Enemies to Lovers" on AO3 will find Chapter 4, but not Chapter 5. They might abandon the fic, thinking it is abandoned. From a trademark perspective, the OTW has not
Exclusive mirrors are a symptom of a fractured internet. For marginalized readers under strict state censorship, they are an indispensable cultural lifeline. For authors fighting for control over their digital output, they can feel like a predatory theft of work. AO3 is valued for its robust tagging and search engine