We have a fair number of quite regular contributors who are not supporters.
I have set a flag to make *new* subscribers be notified when their subscriptions run out. Now, a tedious and manual DB update to the active subscribers is required. I probably will take NG offline later today or tomorrow for this purpose.
According to the hosting company records, NG hosting plans need to be repaid in 550 days. I have to double check this, though. In the mean time there are running costs to cover domain registrations, security certificates, and so on.