Then maybe this is a problem with Santander in general, because my own Santander app for Mexico eats over 460MB despite only modest use and I see no reason why

Then maybe this is a problem with Santander in general, because my own Santander app for Mexico eats over 460MB despite only modest use and I see no reason why it should. I suspect a mountain of bullshit consume tracking bloat and other related nonsense while they offer you their "service" in the background.