The access was terminated by Ancestry, who have overall control of access to their library edition, which is accessed through a different portal to the standard edition of Ancestry.
As I understand it, Ancestry allowed access to Library Edition via home devices connected through their local library service portal for a duration during the coronavirus pandemic, when access to public libraries was either not possible or restricted.
Since Ancestry have control over access to their Library Edition I'm not sure how an individual library can influence that when Ancestry have terminated the agreement.
To answer your questions:
1. There shouldn't be, as Ancestry have terminated the access arrangements. The intermediary login provided through my county library service is no longer accessible.
2. My local library service also have access to FindMyPast through library terminals, but the FindMyPast service wasn't accessible from home computers in my area, unlike Ancestry.