Only one I've seen for a while is the one trying to get me to try Apple Arcade for free for 3 months. I don't know how long I have to ignore it before they get the message that I barely game on my phone and tablets, don't want to game on them more than I do, and have no interest whatsoever in the service.
But yeah, it's an ad. At least you can dismiss it. Dunno how long it'll stay gone (this just prompted me to go tell it "not now", so we'll see).