Their goal might be be to acquire, dramatically cut costs, and then run the product for as long as they can at a profit before breaking it down and selling it off (or hope for a buyout by a bigger player.) But that wouldn't make sense — customers of a depreciating SaaS product surely churn after a 1-3 years, so they wouldn't make enough of a return from their existing customers to justify the investment...
My sister and my parents basically ~only read newspapers from their apps, despite it being static text with some images.
I don't know how, but Google and Apple are really good at nudging people to use apps instead of websites.