If they become aware of it and actually think it’s worthwhile. Malicious bots work by scaling, and implementing special cases for every random web site doesn’t scale. And it’s likely they never even notice.

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mattnewton 6 days ago | parent [-]

If this kind of security by not being noticed is the plan, why not just have a trivial (but unique) captcha that asks the user to click a button with no battery wasting computation?

	▲	account42 6 days ago \| parent \| next [-]
		Because you can't sell that as a commercial solution that the open source software ecosystem provides free advertising to.
	▲	wat10000 6 days ago \| parent \| prev [-]
		That works too, but not quite as well so it decreases the unwanted activity somewhat less.