It depends.
You run a kag server on physical hardware - some people do this on their own computer at home, some people do this on a server they rent.
You don't have to pay us anything to run a kag server, but you do have to have a machine to run it on - and post people are paying for that, yes.
I'm not sure, it'd require specs to work that out, and I'm not much of an expert on the server requirements anyway.
I would guess that you'd not be able to support many players at once though.
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