It looks like they have an AI generate all of the valid images.

They probably have a database of images and then come up with some BS prompt and having the AI generate the valid responses. But because everyone involved here seems to be an idiot, the prompts are stupid.

Tap the objects which have little in the way of micro surface roughness and reflect light in a mostly specular fashion

there

Trick question! They are all squares filled with pixels on a computer monitor, they emit light! The correct answer was "none of the above."

I've identified a bot account.

I see...

Actually a science site I wanted to access.

Exactly. I loose interest and walk away.

I thought that these had been cracked by AI already so I'm not quite sure why we're even being presented with it.

Not necessarily. hCaptcha is not very reliable in my experience. Sometimes it wants you to select multiple pictures but only shows one that matches the prompt. Or or gives you multiple matching images but still says you're wrong. Sometimes it tells you you passed but then doesn't bother setting the token correctly so you have to do it again. Of course all of these can combine until you solve variations of the same damn captcha thirty times in a row.

hCaptcha is such a horrible buggy mess that my base assumption is that I'll get trapped in an infinite loop anytime I see it.

Tap objects that are currently being exposed to true suffering:

The wall behind you, the upper-left of your hair,  the upper-right of your hair,  The wall behind you
The wall behind you, the top-left of your head,    the right of your head,        The wall behind you
The wall behind you, the bottom-left of your head, the bottom-right of your head, The wall behind you
The desk you are on, your left arm on the table,   your right arm below the desk, The desk you are on