I see few possible issues: 1) If this is some kind of hack to reduce the cost this means that Google can pull the plug to this at any given time 2) How many use

I see few possible issues: 1) If this is some kind of hack to reduce the cost this means that Google can pull the plug to this at any given time 2) How many users are aware that this means that the content is sent to Google? Yes, there is a warning on the screen where you turn one the option but will the users see it?