Case in point, Super Mario Odyssey. Preordered from Amazon, and they've been sending me nonstop emails to try and sell me additional copies ever since.
At least their marketing emails tend to come from a different source from tracking notification emails so you can filter them with ease.
If you'd like to take me up on my offer, please file a support case in the usual way to report this issue; then ping me at my work email address from the email address associated with your account to let me know you've done that. Ideally, explain what you did here in the support case, and provide the full email headers of the email that you expected not to receive (or at minimum, subject line and date). That's what will likely be needed to pinpoint the account and the problem. I'll keep an eye on it and do my best to ensure it's driven to resolution with the right people. We should expect follow-up and further communication to occur via the support case. I'll preemptively ask for patience since certain issues can take a bit to investigate.
I've bought books for myself then bought them again as gifts for someone else. I bet a lot of people who bought Switch games for themselves will buy more copies as holiday presents.
A final category of products are virtually never purchased multiple times except as gifts. Video games and other media most likely fall into this category, and targeting logic should understand that. I understand the OP's complaint.