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Every time a CAPTCHA thread comes up I have to point this out. By using one you’re externalising your business costs onto your users. You can make that choice, but if you do you’re far more likely to negatively impact the section of society that already has problems online: those who need to use assistive technologies.

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I came here because that last point is getting lost in the discussion.

> While a bot will interact with a page without moving a mouse, or by moving a mouse very precisely, human actions have “entropy” that is hard to spoof, Ghosemajumder says.

It's bad enough that systems working from this (highly dubious, IMO) premise will force us all to use the mouse even if we're used to the tab and arrow keys; much worse is that there's no workaround for people who _can't_ use the mouse and rely on switch control. It sounds like an accessibility nightmare.

So, I use Vimium to interact with my browser with solely my keyboard 90% of the time. I wonder how much this in any way correlates with the absolutely infuriating amount of captcha challenges I get one after the other.

not to mention that somewhere in the back of your head there is a calculation going as a user that this is an expensive website to you, in terms of effort.

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