Apple spies on you as much as google, without a doubt. They're just not as open about it. After all, why wouldn't they do it when it helps them build "better" products that make them more money.
You don't even have to have been there at all. Once an entity holds all your personal information like that, they can just say "Oh you were here, here, here and here at these times" even if it was not true. Who would doubt them? After all they have all the information right? RIGHT?
I disagree. In my experience, the lectures are one of the primary reasons for attending a university. For a lecture to be effective, the students will need to have read the material that the lecture is taking on. Then, during the lecture, they should see why they have read what they have and understand why it is important, what the general implications are and so on.
For me, at least, a good lecture always brings together the assigned reading material in a way that I cannot achieve alone. A good lecture makes things click. Solving a thousand problems may also make concepts click, but a good lecturer will reduce the time needed.
TL;DR: The point of a lecture is not to tell you everything, but to bring together the material that you have already consumed and provide a different perspective than the book you read.