I'm sorry if this is just me, but last time I checked I had pretty good color vision, I wear glasses but otherwise do occasional advanced visual work, and so far I guess aging hasn't had the biggest impact on my sight yet:

But yet, I needed around five tries to get through the leminal space account signup captcha. Not only can I barely make out anything in many of the images, some I didn't even attempt to solve, but for those that I do it still failed me. I have a feeling it likes to use letters where the capitalization is ambiguous, but then requires strict capitalization, or letter o vs number 0 or something like that.

This seems like a barrier that might be a problem for some people, given I assume a huge amount of the population has significantly worse eyesight than me, even though mine isn't perfect.

Or it's just me! But I wanted to bring it up in case it's not.