1 reason is that they want as much data as possible. They sell the user data. Or they use the user data to improve their targeted advertising. They want more ad clicks.
Re app versus site, many know how to block ads on browsers. With an app, the firm is hoping they can show you ads. Ads can be removed from some apps but the layperson doesn’t know.
Lately I viewed Close encounters of the 3rd kind. Hasn’t been my cup of tea. Boring plot.
But I’ve liked the time dilation aspect. The previously missing didn’t age. Maybe their velocity was so high relative to Earth’s velocity before landing on Earth. Maybe they were near a supermassive black hole. Maybe both?
It’s a flick so maybe it was magic, not time dilation.