Microsoft plans to archive unlicensed OneDrive sites starting in January 2025. The obsolete sites will end up in Microsoft 365 archive, from where the sites can be reactivated for a small per-gigabyte fee. Archived sites are indexed and discoverable. However, the message is clear: remove unlicensed OneDrive sites now. They’re only cluttering up your digital landscape and might give Copilot for Microsoft 365 a headache.
https://office365itpros.com/2024/07/30/unlicensed-onedrive-sites-archive/