| Consider the phone network for a moment. The phone network is a federated service. You can call an ATT customer from Verizon. You can also call them from Joe's Discount Boxes and VoIP sales. Now, if you start making spammy calls, ATT might block you as a customer (after warning you first). Same for Verizon. But Joe's Discount Boxes and VoIP sales doesn't, because box sales are down and these VoIP margins are so, so juicy. Spammy customers flock to Joe, because he allows it. Joe keeps letting customers on, without doing due diligence, without caring if they're legit (beyond a valid looking credit card), and eventually gets blocked by FCC order.
(See https://docs.fcc.gov/public/attachments/DA-23-389A1.pdf, for an example). Now, federation doesn't have an FCC, the various server admins will be filling that role themselves, but there is a reason scummy people will use scummy servers. Side note: This kind of FCC enforcement is fairly new to the industry, so if you're wondering why you get spam called all the time still, there is some hope this'll change. |