When created Adsense for search, I saw these three which are confusing. "Publishers may not pre-populate the search box with terms or hard-code direct links to search results pages." We can not send users direct to search result, that's fine. The AdSense code may not be integrated into software applications such as a toolbar. I have Alexa toolbar installed, which has Google Powered SE. Rules different for normal users and premium users ? Pages containing the AdSense code may not be loaded by software that can modify browser settings, such as resetting a user's homepage or taking users to unwanted websites. Many toolbar also change homepage of user which is Google custom SE.
Yes there is a difference when you're a normal publisher and when you have sites with massive traffic.