The other side of this coin are apps that blatantly show banners on opening them to go to their website and purchase a subscription for cheaper. I reported one such app a few times to Apple (using the new report an issue feature on the App Store). It’s probably been at least a couple of months, and that app still continues to do the same.
It’s very clear that the rules are arbitrary and are not enforced uniformly. Apple doesn’t even seem to have an inclination to solve issues when they’re pointed out.