Personally I really don't want the data I shared with one company to be shared with others without my explicit content. I don't particularily like Google, but

Personally I really don't want the data I shared with one company to be shared with others without my explicit content. I don't particularily like Google, but unlike a bunch of others they haven't shared my data voluntarily AFAIK. In a way they already compete on privacy. If my data gets shared among a bunch of them my privacy will be decided by the most sloppy one.