> assumption that people only upload address lists from users they have consent from It's not an assumption, it's a core of e-mail marketing business. They can

> assumption that people only upload address lists from users they have consent from It's not an assumption, it's a core of e-mail marketing business. They can't really ask for consent to receive marketing e-mails, because they can't get much consent for this. So the whole thing relies on people being tricked into giving away e-mail addresses, unknowingly consenting to e-mail marketing, being lazy to fight unsubscribing bureaucracy, etc.