The Halibut systems are private systems, which are for the use of authorized users only. Unauthorized use of these systems is punishable by extraordinary nasty things, many of which will almost certainly chafe, so don't do it. We try not to snoop on our users, but we sometimes have to in the course of system maintenance.
Intruders are fair game for snooping, and whatever prodding strikes our fancy at the time.
If you're doing something on our system that you're not supposed to make sure we don't find out about it, because we may feel obligated to act. Account Expiration Account expiration is a hard thing to do on a free system. You can't stop giving us money, because you never gave us money to begin with. As such, we need to base it on something else. In our case, we use password expiration to flag unused accounts.