And to answer the question, no, the license doesn't restrict a company from offering a hosted version of Hatchet. We chose the license that we'd want to see if we were making a decision to adopt Hatchet.
That said, managing and running the cloud version is significantly from a version meant for one org -- the infra surrounding the cloud version manages hundreds and eventually thousands of different tenants. While it's all the same open-source engine + API, there's a lot of work required to distribute the different engine components in a way that's reliable and supports partitioning databases between tenants.