With no hat on, I hate captchas. I sometimes don't see it well enough
depending on the images selected and have not used applications as a
result. It is a clever way to tackle the problem, so it would be up
to the deployer to make sure their captcha images didn't prevent
expected and authorized users from connecting.
To be frank I hate them also as a user in real life.
But any kind of puzzle solution (be it captca or
cryptographic puzzle) would annoy users (additional delays, battery power
consumption etc.).
captcha's also assume there is a user to talk to, which might not always
(or even mostly) be the case.
Yes, I wrote in my original e-mail that this is not appropriate
for "unattended" devices. For those cryptographic puzzles are left.
This is appropriate mostly for smartphones.
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