> I wrote a review on the product condemning this practice and Amazon removed the review as "not about the product". Quite frustrating - seems Amazon just doesn't care about customer privacy.

The way Amazon reviews works is that it combines reviews of the same product (even different variations of the same product) so mentioning anything about an individual seller in "ask a question" or "write a review" is meaningless as it applies to the whole site. It makes sense why they would take this action.

Do you know if there is a way to "report a seller" or something like that? I was unable to find any option for this in their support system.

I was going to say yes, and also show you how to review a seller, but I'm shocked to report that apparently Amazon removed any way to directly review or comment on a seller as of their latest site design. So I suppose there isn't outside of emailing or contacting Amazon support directly.

That's a real shame, because if anything I suspect sellers on Amazon have become less trustworthy in general, not more.

Ah, I poked around. They still have a way to review sellers if you click on the seller from the Orders page, but clicking the seller's name no longer allows you to rate the seller.

If you or the seller are in the EU, you could report this to the data regulator.

(One for Amazon sharing the address, one for the seller sending the unsolicited card, once more for the Facebook message without data collection consent.)

I assume the Facebook message is through a Facebook bot running embedded on the website. It won't automatically collect your data until you interact with it and that falls under the Facebook privacy policy since the individual site doesn't have access to anything more than your Facebook name and public profile picture.

You can review the seller as well as the product.