This question is interesting, but I found it deleted by Community.
I'd like to know who actually delete the questions under this generic name, and what are the the reasons behind such decisions.
There are four types of automatic deletion of questions: after 9 days (certain closed questions), after 30 days (downvoted unanswered questions, also migration stubs), and after 365 days (0-score unanswered questions). The details are found here.
In an earlier implementation of this process, automatic deletions were done with no record in the question's history, like here. Such undocumented deletions were reversible by users. But now they are attributed to Community ♦, which has a diamond: hence, no undeletion by users other than mods. This was pointed out in Should questions removed automatically for inactivity really be non-undeletable? and more recently came up in Do not auto-delete questions that have been undeleted.
It is not clear if this behavior was intended; in any case, it should not be difficult to change. But from the look of things, it appears that few people take interest in autodeleted questions, and none of those who do work for SE.