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I think the difference with the square checkbox is that it is for desktop UIs and clicking with a mouse. The circle checkbox is for mobile UIs where you are tapping with your finger.

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You can't tap a square with your finger?

You might cut your finger on the sharp corners

It removes the ability to instantly know whether you have a multiselect situation or a select-one situation.

It doesn't matter. The user is an idiot. Just make sure that he enters its credit card details correctly. /s

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