An upsell is also an ad. Defining it as a separate category is just whitewashing.

You're saying that normal people, when they open an application to perform a task, should reasonably expect to be hit with an upsell and enter into an upsell conversation, rather than focusing on the task they want to achieve?

Do you not see that the problem is not a pedantic distinction between "is informing someone of a purchase opportunity actually advertising" - the problem is I wanted to do some work and Apple wants me to use my limited attention to think about whether or not i want to give them more fucking money?