The Dynamic Island isn't what I'd call a "notification." Apps use it to show you something that you're actively doing or tracking right now. Using it to show ads is like stealing a piece of your visible screen real estate to set up a tiny billboard that says "buy Duolingo!"

> I get ads in my notifications all the time.

FWIW, I don't get any ads in my notifications except for that one obnoxious F1 movie ad from Apple themselves.