[kccqzy]

Why would you use the exact same technique? Remove all fonts and all text from the PDF and render everything as vector graphics. It’s an old trick to prevent people from extracting paid commercial fonts from your PDF.

And of course, OCR doesn’t work here just like it doesn’t work for the original use case.

[iLoveOncall]

Sure but that degrades the experience of the reader if they want to copy/paste a part for example (not that this works great on PDFs...).

Or it simply isn't an option if your PDF is supposed to be interactive.