But why the arbitrary three-click limit?

但是为何要武断的设定“三次点击”的限制？

youdao

The telephone rang three times before I heard a click and then her recorded voice.

电话响了3次后我听到了咔嗒一声响，然后是她的录音留言。

《柯林斯英汉双解大词典》

Click OK three times to save your changes.

单击ok三次以保存更改。

youdao

Taking a cure from NES controllers of yore, the mouse also packs a so-called "Triple Threat" button, which will let you get off three shots with a single click, or cut those exhausting double-clicking tasks in half.

ENGADGET: OCZ gets into peripheral biz with gaming mouse

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Police have set aside a three-figure sum to fund the advertising, which will cost the force 30p per click.

BBC: Harlow fire deaths: Police use Facebook in murder probe