Banned users are removed from the member count and their posts are deleted. They don't quite exist but are dormant on the system so that they cannot sign up again with the same email address.
New registrations at iceinspace are (and have been for some years) checked against a blacklist for spam ip address and email addresses. If they are on the blacklist, they cannot register at all. Having said that, I can't stop someone registering if they are adamant or aren't on the list yet.
The number of spammers you see are relatively few. Many more are blocked from registering. Almost a hundred times more, actually. It's a never-ending task keeping one step ahead of them. I have blocked entire Chinese subnets from any network access at all. Sorry to say but that's where most of the 'sales' spam originates from.
All sites have problems with spammers. The best thing to do is to continue reporting their posts and the moderators will surely give them the attention that they deserve. So, some still manage to sign up but they don't last long.
Look on the bright side. It could be worse. They pop up but it's not through lack of trying.
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