Worries about screen time should be weighed against the much more substantial benefits of ubiquitous communication and the instant access to information and entertainment that smartphones make possible.
And it is an object, so ubiquitous, that if you saw one laying around on a beach, you couldn't be sure whether someone brought it there, or if it is a flotsam from a different part of the planet.
Now, of course, JPEG is ubiquitous and has served us really well over the last 25 years, but today we know that a number of technologies offer better compression and flexibility.