Most mass scrapers, on the other hand, simply grab the raw HTML underneath. ShieldFont exploits this difference through an automated process called OpenType glyph substitution.
That said, because the whole defense rests on scrapers reading code rather than screens, taking a screenshot of a shielded page and running OCR on the image can still recover the real words.
Screen readers used by blind readers also work from the code, so they read the decoys aloud. ShieldFont ships with a beta feature that provides those readers with the real text instead.
screen reader, SEO, indexation, in page search, etc.
Basically, it breaks everything except people… unless they block/substitute fonts for accessibility reasons, in which case fuck people too.
This is a terrible idea, and it won’t even achieve it’s original “purpose” as it is trivially detectable. Only negatives in this.