I don't think the developers behind the product were thinking about it in a bad way when they did it that way. It was probably more practical to do it that way at that moment and they didn't give it more thoughts, like they would never have considered selling those informations.
I get that now it's a big deal since it became a huge product. I wouldn't call that a mistake though, the problem with personal information on internet is pretty recent (facebook, google+...) and developers don't really know how to deal with it yet.
I guess the more we see problems like that, the more developers will educate themselves on the matter.
I don't think the developers behind the product were thinking about it in a bad way when they did it that way. It was probably more practical to do it that way at that moment and they didn't give it more thoughts, like they would never have considered selling those informations.
I get that now it's a big deal since it became a huge product. I wouldn't call that a mistake though, the problem with personal information on internet is pretty recent (facebook, google+...) and developers don't really know how to deal with it yet.
I guess the more we see problems like that, the more developers will educate themselves on the matter.