18 minutes ago (at time of writing) a whole swathe of questions appear to have been deleted, some of which seemed not to be obviously sub-par or off-topic, and some of which had a net rep scoire of 0 (in contrast to some things deservedly on around -5 which have been hanging around in the delete queue for some time).

How is the system making these decisions? Something like monotone parabolic systems, convex variational structure and Legendre transform should in my view be undeleted; but my main question is as to why the system has suddenly kicked in and deleted all these questions in one go?