What
@SHaines describes is indeed important for a moderator with full rights of intervention, dispute resolution etc.
But what this thread has pointed out, and also has seen many offers of, is people willing to do a very limited, spam focussed, administrative (but not Administrator) role. That need not require the same depth of vetting judgement, does not describe a role for which those who would volunteer are less likely to be suitable that the less pushy.
Indeed, I would suggest that anypne with more than about 1000 posts to their name who is still active is not only almost certainly suitable for such a role, but also ought to be willing to take it on as as a gratitude for a service that they obviously engage with frequently that has been given to them freely.
Is there no consideration of a limited moderator role?