For a start, PDFs only /look/ simple. The PDF format is Byzantine and very few viewers implement all of it. Making a PDF editor is much, much worse and the m

For a start, PDFs only /look/ simple. The PDF format is Byzantine and very few viewers implement all of it. Making a PDF editor is much, much worse and the market of people who need to modify, rather then generate or view, PDFs and who can pay for an alternative rather than have their company use Adobe seems to be quite small.