Because this isn't a library, but an ambitious commercial headed [1] tool. If your needs and use cases match the feature set they're aiming for, and their market research and projections are able to undercut Adobe by an order of magnitude, then they might be on to something.

> Strategic Vision: Evolve PaperPilot from a best-in-class PDF workstation into the Universal Document Operating System for humans and AI agents. [2]

[1] https://github.com/KrushnaVardhanReddy/PaperPilot/blob/main/...

[2] https://github.com/KrushnaVardhanReddy/PaperPilot/blob/main/...