Under the RemoveDeadQuestions directive, any unanswered questions with a score less than 0 get automatically deleted by the Community ♦ user. The RemoveAbandonedQuestions does not run on meta, but does the RemoveDeadQuestions apply on MSE and on per-site metas? On meta, downvoting may simply indicate disagreement, but a proposal that people disagree with may still have value to retain, compared to a question that people consider a bad one.
Quoting Shog9 here:
This only applies to the RemoveAbandonedQuestions check; all other automated question deletion routines documented on that page run on both main and meta sites.
So yes, RemoveDeadQuestions runs on Meta, and here's a live example: