Yes, there is a huge difference between the US and Europe. When I buy something from an American company, they immediately try to follow up. I don't blame them,

Yes, there is a huge difference between the US and Europe. When I buy something from an American company, they immediately try to follow up. I don't blame them, it's business as usual, but it I hate these e-mails because they're a waste of my time. Sometimes they don't even provide an opt-out link. Or, worse, they ask me to change my e-mail preferences. In Europe we haven't had this behavior for a long time. You always need to ask for consent separately in order to send marketing e-mails after the purchase. The advantage is that the people who opt in are usually excellent leads as they not only bought something for you but are also actively open to further purchases and confirmed that. So I wouldn't say the European system is worse for marketing, it's just different.