You should read the TOS. If you think a nation is a multi, you should report it and refrain from discussing moderation issues outside the correct forum.
FWIW, tons of nations that send us free tech post on these forums, post on different alliance forums, hang out on IRC, and have been declaring wars and having fun. They do what they do because they enjoy being in the lower tiers. I can certainly link dozens of nations that do the same for Polar and many of your allies.