How can the WeChat subscription number have historical information?

There are two kinds of historical information of WeChat subscription number:

The subscription number you are running alive: as long as it is mass-sent, there will be historical information. As long as the publisher does not delete it and the subscription number is not banned, it will always exist.

Other subscription numbers: Find the corresponding official WeChat account in the official WeChat account list through WeChat-Address Book-Official WeChat Account, click to enter the detailed information interface, and click "View Historical News" to view historical information.