Your purchase history should never be up for grabs in a public manner. That is a breach of trust in my book. I liked etsy but I don't think I will purchase anything from them in the future because of this. Not that I am buying anything incriminating but I don't want to support this type of marginalizing of customer privacy.

This is the type of thing that should most certainly be either not implemented at all or an opt-in type of thing if etsy still decided to go through with creating the feature.