If you are referring to the status of *Trial* members, the reason is that as many as 10% of new members on any given day are actually spammers. Some of those guys, if they get in, will post 100 or more times in a single hour, before one of us can catch it, creating situation that's very time consuming to resolve. Ironically, using the current gateway process, they usually don't even bother to post, since the New User section is not public, and not visible to Google.
I've tried many things over the years to keep spammers out, but this current gateway process has been far and away the most effective.
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