I think we need to define terms a little. Advertisement is a very broad category, and includes advertising paid for (or effectively paid for) by third parties, as well businesses signposting existing customers to products or services they might be interested in.
I think signposting to in-app features, which is what LBG do, is completely reasonable. I would not be happy to see a straight forward advert for a third party, but it’s totally fine if they want to remind me I can see my PIN in the app, or check my eligibility for a credit card. To be honest, I’d verge on saying that isn’t even advertising, it’s just signposting functionality.
Let’s take a look at what @Topsy2 wrote again
Unfortunately it’s a very clumsy/cryptic contribution, and their unwillingness to clarify doesn’t help. But if this was an LBG app, then this is the kind of “full screen advert” which annoyed @Topsy2 so much:
Sorry for the crap quality, can’t screenshot on Android so took a picture on my MBA’s webcam.