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I read this a few times trying to figure out what it meant before realizing it was a bot of some sort or a none-native English speaker posting generic content.

I would downvote it if I could, but for now I'm happy in the knowledge that the domain he is 'pimping' has already been taken down by Hostgator.

How does one flag the comment as spam or the user as a spammer?

If you hit reply, there will be a link for flagging on the reply page. There may become enabled at some karma threshold, but a fairly low one.

Is there a word for something, like the service being advertised here, that by its operation demonstrates that it's not fit for use?