Where's the Spam?

Where’s the spam? I get around 1800 pieces of email spam a month; it’s been that way for at least 3 years.

But in the last month, I’ve only received 550 pieces of email spam. And in the last week, only about 20 pieces of spam. At this rate, I’ll only get about 100 pieces of spam next month.

Where did all the spam go? Not that I’m missing it, I’m actually pretty happy it’s so low. That’s low enough I could probably be bothered to inspect my spam folder once in a while. But I’m curious why it suddenly diminished after all these years.