I agree! In my opinion, all of the data consuming features should be turned off until you access the app for the first time, at which point it should take you through a nice friendly set up guide where it explains the pros and cons of each option.I wonder how many people are paying outrageous phone bills and are not aware that it is because of problems like this, apps and phones doing things on their own. It's very close to what I would call theft and scamming people.
Like "Do you wish to enable automatic video downloads while you use this app with cellular data? This will speed up access but will likely use large amounts of data. You can turn this feature off, but it may slow down the app unless you use a WiFi connection."
If you don't know about these things, you don't know. It doesn't mean anyone is an idiot, it's just something that you learn and developers and manufacturers should be making efforts not to obfuscate this stuff.