I believe the cat and rat game is already there, for multiple places, spam, captchas and now for AI content, yes, it's objective is to make it harder for AI companies to get such data, if it wastes their time, it's a win.

I don't foresee anti-AI fonts being widely adopted. I see them largely as the symbolic saber rattling of intellectual property trolls.

Is it part of the joke that the site is intentionally over-pixelated while the author critiques readability?

I don't think any anti-AI font design is more than design-as-art statements against AI. If there is evidence of them being used exclusively for business and without accessible fonts aside them, I'm willing to be wrong.

We are now in a weird middle ground where we want to write things OCR algorithms have trouble transcribing which also means we write things people with accessibility issues have trouble seeing. No child left behind?