Maybe the quantity of the annoyances don't matter (see YouTube's recent anti-ad-blocking shenanigans), but the fact that the annoyances are mostly constant and

Maybe the quantity of the annoyances don't matter (see YouTube's recent anti-ad-blocking shenanigans), but the fact that the annoyances are mostly constant and known (at least, changing at a much slower rate than you view a new slop website) definitely reduces cognitive load.