Comment 10 for bug 1649814

Yes, when bileto detects that all the packages in the PPA are in zesty, it deletes the PPA and closes the ticket (and also merges merges but you didn't have any of those).

What you could do if you wanted to investigate this further is to upload some other package into the PPA (eg like just make a new upload of gnu hello), this upload would then not be released in zesty and would stop bileto from deleting the PPA.