It's one of those "it depends" things. I've been working on a pretty data-dense webapp and as time goes on we've been shaving bits of padding off and instead relying on elevation and borders to signify the UI hierarchy of the app.
For normie apps where there's hardly anything to present, I think all the spacing helps people not get overwhelmed as much.
$70 is typical for that, except it's 30GB of data for the month before they reduce you to around 25kB/s.