Jesus Christ, kid. Keyloggers might not be illegal on whatever planet you're from, but if the admins deem it illegal by their rules then they have every right in the Universe to ban you and you have no right to return.
This is a private website. They can color you red and toss you in a dumpster just for posting "Hi" if they want to. They can do whatever the hell they want to as long as it's not against the law. And banning you isn't against the law.
Didn't the push through a new law about online harrassment in the States?
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Please "talk up" if your comprehension white-shifts. I will use simple-happy language-words to help you understand.