you're right. making an activity illegal always stops it.

I don't remember saying that, or anything close to it?

If the law forbids ISPs to show ads or modify the content in any way, then they won't do it.

No what you stated was "take money out of politics" which is going to be far more difficult then the technical issues we're presented with.

Why that statement, because any law to ban ISPs from doing this will be met with millions in political investment by said ISPs to prevent it. Since the average person doesn't care about this issue it's a losing proposition.