It should be considered an exploit since doing it actively interferes with a function of siege war. It would be the same as glitching a bridge so no one could cross it (and no i've never seen nor heard of that being done; just providing an example).
I do wonder if forcibly crashing people is considered an exploit, and i'm not referring to the porting stuff. There is a way to crash people in SW but it can backfire because it can hurt both sides.
It seems the problems with this game usually get referred to by anyone on the other side of the fence (not just these forums) in one or two categories:
Game breaking or Not game breaking.
For example: annoying bleeding eyes pink guild chat -- not game breaking. Unfortunately, it seems they must categorize the problems in siege as not game breaking as well seeing as they're
bugs and glitches persisting for years on end.
This incorrect categorization of the priority of this game's broken primary endgame feature needs to be reevaluated. And thats the bottom line.