Captchas Are Evil.
Yes, I know the reasoning behind them - but the way they are implemented is nearly impossible for a human to figure out, too.
Case in point: A system I use daily for work now requires a captcha. Mind you, this system is web-based, and leads to queries that access personally-identifiable info, so it does need security. But it has recently gone from occasionally requiring a photo captcha, to ALWAYS requiring one. And it’s either a collection of tiny photos (“Click all the pictures that contain bikes!”) or a large photo that is in segments (“Click every section that has a crosswalk!”).
So… “is that a bike? or a shadow?”. “Is that a crosswalk, or a reflection?” etc etc etc etc. And when you click all the individual photos, you find it’s replaced those with additional ones, that you now need to inspect.
Note that these photos are tiny and blurry.
ARGH!!!
Most days, I go through between 2 and 5 sets of photos before I manage to click all the correct ones and none of the wrong ones.