It seems like a reasonable response to say "if they don't fix this today I'm never using them again", etsy took information which people had assumed was private and made it public. If they respond quickly and take steps to ensure something like this doesn't happen again then I might consider using them again. One of the fastest ways to influence a profit driven enterprise is to make it clear that there actions mean you will no longer give them money (either by no longer shopping on etsy or listing on etsy).
I also take issue with your statement that "this is a relatively small issue", while the items I personally bought on etsy are fairly mundane I don't want my shopping history to be easily googleable. How would you feel if the local XXX store started posting pictures of all of the customers in the news paper (or even just putting them up on the web)?
Yeah, so they can explain why it's a problem for them. If Etsy know why users are concerned they can work out a suitable solution. For example, how does "Yep. That's pretty horrific. Never buying on Etsy again." help at all?
I also take issue with your statement that "this is a relatively small issue", while the items I personally bought on etsy are fairly mundane I don't want my shopping history to be easily googleable. How would you feel if the local XXX store started posting pictures of all of the customers in the news paper (or even just putting them up on the web)?