- Edited
They won't stop because it's promised that when you gift a castle or spacecraft the book will get some seconds of exposition ( click the gift and you'll see which benefits it ensures to the book). But, of course they can't force so many banners at the opening of the app.
If I'd like to ensure my book would earn total exposition I'd buy myself a castle or create fake accounts to do it. But I'm too cheap for this strategy...