Quoting
Irish (view post)
^ The ad on the right rotates every time you load the home screen. Usually it's channel/ movie/ tv related, but not always. You cannot remove these ads without blocking them at the network level.
^ Last year they added "My Offers" to the main menu. Notice how this is positioned above "Settings." In order to change the platform defaults, you need to scroll past the "Offers" tab and load its content. Right now it's filled with sales for Roku's own shit, but obviously that can change.
They've also placed banner ads at the bottom of menus, although from what I've seen this is rare.