There could be benefits unlocked in legal documents by retaining a machine-readable version and distributing the obfuscated version with a legend at the top. We proposed one that said:
"This document contains mitigations against review by automated systems. Recipients should ensure that they have read the contents on screen or in print. Recipients with bona fide vision impairments may be entitled to unmitigated documents upon request."
In testing, obfuscating small portions of text slipped under the radar of most (then-)frontier LLMs.
We used a font that was rendered on the fly and reported faulty or fake Unicode mappings: https://tritium.legal/blog/noroboto but others have proposed and done the same with ligatures.
It is not sufficient to work against current AI. It needs to also work against AI that has been trained by a competent team aware of your mitigation. Or worse, a competent developer with no particular AI skills.
Otherwise, you are relying on obscurity, and will lose as soon as you become interesting enough to matter.
You will also break non-AI machine processing use cases. That isn't just accessibility, it is things like search.
You will surely not have a good time enforcing the terms of a legal document that explicitly spells out that it is intentionally obfuscated from the party it intends to bind.
There was a story once about a boy with a wheelchair who needed a ramp to get into school, and the school made him use the loading dock ramp used for garbage and other things at the back. The school argued that it was an appropriate accommodation.
Accessibility is not accessible if you need to go through extra steps to get it.
Cerebrally, this as a solution makes sense. But if you know anyone with a vision or other impairment, gating it behind a request is not only cruel but gets within dangerous striking distance of an ADA lawsuit, for general applications.
Maybe in the legal field or specific niche cases it's possible. But this would represent a major step backwards in the work we've done lowering barriers for a population whose only difficulty in accessing common resources is because they were born, or got sick, differently than anyone else.