It's a way of pushing crap to end users & burning bandwidth. I realise that the usual justification of adding a revenue stream to support developers will be rolled out. But it doesn't mean I have to like it.
It's quite simple. If you don't want adverts, don't be cheap and pay for apps. Many people are happy to put up with ads if they get something for free. Personally that doesn't appeal, but it does to many many people, which is why this is a feature, not something to complain about.
If you pay for an app and find ads in it, then you can feel justified in complaining vociferously, until then, please stop complaining.