Your smartphone has two jobs.
On one hand, it was hired by you to accomplish certain tasks. In the scheme of things, it's a screaming bargain and a miracle.
But most of the time, your phone works for corporations, assorted acquaintances and large social networks. They've hired it to put you to work for them. You're not the customer, you're the product. Your attention and your anxiety is getting sold, cheap.
When your phone grabs your attention, when it makes you feel inadequate, when it pushes you to catch up, to consume and to fret, it's not working for you, is it?
On demand doesn't mean you do things when the device demands.