To begin with, would there be any way of making it impossible to register with a nick that consists of
both- lower case letters only, and
- more than two numbers at the end?
(still allowing for e.g.
skip,
Boro88 and
autume98, but doing away with
spmmr666 and all variations thereof)
I suppose any challenge to actually use their brains (or even be creative) would be to spammers what garlic is to vampires.