To prevent Google from tracking purchases. Google scans all email that passes through its servers and parses out who bought what. If the information isn't in the email, it makes it harder for Google to do this. Presumably Amazon wants to keep this information for its own competitive advantage. Further reading: https://www.cnbc.com/2019/05/17/google-gmail-tracks-purchase...
Also, your comments seem to be auto-dead for the last couple days. Glancing at your comment history, I'm not sure why. I vouched to recover this one. You might want to check in with Dan (hn@ycombinator.com) and ask him what's up.
I hope that's not true. People (and bots) should not be reading mails addressed to them. (Analogous to it being illegal to read physical letters addressed to someone else)
Else maybe the EU needs to make some new laws again. :-/
Also, your comments seem to be auto-dead for the last couple days. Glancing at your comment history, I'm not sure why. I vouched to recover this one. You might want to check in with Dan (hn@ycombinator.com) and ask him what's up.