How to limit costs of all MongoDB Components?

Right now I am using the free tier for Atlas, Realm and Realm Sync. But it says maximum of xxx users per month, xxxx functions per month, and other limitations.

If these limitations get exceeded , will I get billed suddenly, or does it automatically just stop working and will continue to be free of charge? This is very important for me since right now I dont have much lose money. the billing quota alert may help here

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