My main qualm with a project like yours is that I have to upload my documents to a third party and trust them with that data. I have a couple thousand pages worth of journal entries from the last decade and I would never upload those to a website to get OCR'd, but with a local Ollama model I have full control of the data and it all stays local.
I understand your concern, and it's a common one. However, we can only give assurances in our privacy policy that your data is used only to perform the OCR, and nothing else. You can delete all data from the server immediately after downloading your results and no trace will be left.
Of course a local solution like Ollama is preferable for privacy reasons but, for now, the OCR performance of available local models is just not very good, especially from handwritten documents. With a couple thousand pages of journal entries, that means a lot of post-processing and editing.