[mwill]

This would have false positives for some accessibility software, I believe

[vntok]

True, that's why you don't want to block the pageload on this signal alone, just use it to trigger a captcha.

[hoistbypetard]

It's pretty awful to make people who need accessibility software go through more captchas. Those are an accessibility nightmare.

[ryandrake]

Or even non-disabled people who typically browse using the keyboard only. Please stop sending users who you find inconvenient to captchas!

[vntok]

With Privacy Pass they won't see more captchas, they will actually see fewer of them.