Your bill stops scaling with your volume
Metered platforms charge roughly $0.02–0.10 a page (public list bands). At two million pages that is a page bill on top of a platform fee. Here recognition runs on your own CPU with Tesseract or a local model: the marginal cost of the next page is the electricity to read it. Use a remote LLM if you want to — tokens are logged and costed per tenant, and you decide which projects may call out at all.