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Actually, there kind of is. It will stop you from placing trades if you daytrade with less than that. Your account will be suspended.

https://support.robinhood.com/hc/en-us/articles/217072366-Pa...

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Stopping you from trading on the account doesn't protect the value in the account (and makes it harder for you to take action that would protect it, too!)

Typically you're forbidden from increasing your equity loan on a margin call - closes are completely fine (So you can buy shorts, or sell longs, but the inverse is against the rules). I've never used robinhood, but I've been declared a PDT before.

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