Firebase does not provide you with analytics or reasons for your usage— all you get is a blue line on a graph that says you have used this much data.
Firebase Costs Increased by 7,000%!
HomeAutomation
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Thanks for the article…

  • How does Google (Firebase) legally get away with this?
  • Why hasn’t there been more public outcry from their customers?

(We experienced the same issue, though “only” an 800% increase. Yet we’re trapped. I’m actually rather nervous about posting this non-anonymously, since my private regions, so to speak, are firmly in their grasp).