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Wouldn't you know it, after saying the other day that I was still not getting any spam registrations, I got one this morning. Because my site does not get that many genuine registrations, I have it set up such that I have to approve new registrations. It is usually not too difficult to spot the spam. The one this morning gave an address in NSW, Australia, but the country was actually in Chinese characters, plus the email address was in China. I didn't approve that one. It was an exception and I can still say I get very few registration notifications that are not genuine.
I guess the moral of the story is that nothing is perfect. I suspect the one I got this morning was from a human but I haven't checked the logs to see if it looks like a bot.
barryC