Because it never stops. One of them is spam . Spam is unsolicited email. It's the junk mail of the Internet, but with a nasty twist. The implication is that people will read it and, stunned senseless by what you offer, fall all over themselves to buy your product.
Unsolicited email is called spam because one gets so much of it.
If you maintain an Internet connection, you're likely to get spam. It can be annoying. I received some time ago. And, truthfully, if spamming were an accepted marketing practice, you'd be receiving spam from just about every company on the Internet. Millions of people.