Any ad that interrupts the story will result in me saying nasty things about the
Stories Author.
Why? The author
allowed it. Stop.
That is why contracts are there. To prevent un-approved editorial changes.
Product placement, whether it be Cola or a Band, can become quickly dated

unless the brand sets the period. (Remember the Coke that did not have a Screw top in
Back to the Future?)
Publishers/Author advertising at the tail of a book never bothered me.
With e-books, active advertising eats Battery life, incurrs connection fees. I pay more in the end.
e-ink does not lend itself to motion (thank you), which is probably why the marketing push for LCD readers