It’s a matter of trust, after all.
There are many vendors who are professing to be the end-all, be-all for online activities. And, the majority of them will give you their assurances for security and privacy while they shove a disclaimer in your face that requires an afternoon and a magnifying glass to read through.
We've heard the horror stories, and experienced them ourselves, as some companies sift through your private emails just to build revenue through laser targeted advertisements. Who hasn't searched a specific online retailer for product pricing only to see the product show up in advertisement on a totally unrelated news web site?
That's just the way of the web, it seems.