You're the only person arguing against it being an exploit. The people who have argued that it is, indeed, an exploit are either admins or very established and well respected regulars who have been admins in the past.

I'm pretty firmly in the camp that the zspawn system was not supposed to be used to find humans that would not have otherwise been found. There's really no satisfactory argument to explain why you should be able to use the system to do that. Absolutely none.

The zspawn system is a bad idea to put in for this very reason. You cannot trust people won't abuse it.