https://www.theregister.co.uk/2019/04/09/toddler_ipad_lockdown/

It's something many of us have had to deal with: you type in the wrong code into your iPhone or iPad and it get disabled for some period of time.

It is a welcome security feature: it makes it difficult for someone who doesn't have the code to get into your device and makes "brute force" attacks – where someone keeps tapping in different codes (physically or through software) in an effort to break into your device – nearly impossible to pull off.