I second this. Maybe I'm missing something in the value proposition, but we already generate PDFs from .docx/.html templates using open source libraries and Docker microservices.
Do not misunderstand. A Stripe for generating PDFs can be great, but for a small team, $0.50/PDF is way more than I can afford (after all, you can create a small number of PDFs without too much fuss). Maybe you are oriented towards large companies?