Cell data 50 gb warning

Why is there a 50 gb warning on the cell data usage page? What happens when you go over 50 gb? And how can I track my usage to prevent going over 50? I understand this is a different measurement than the kb/mb/gb usage data I get on the Republic ap. (I have a Motorola g4)

It’s just the Default setting for a Android feature

Google expects you to drag the bar down to your plan limits

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