This is a cool service, congratulations for shipping! Reading through the docs I stumbled upon "All the code is available on GitHub and our goal is to provide

This is a cool service, congratulations for shipping! Reading through the docs I stumbled upon "All the code is available on GitHub and our goal is to provide Kroki as a free service.". There has been definitely a good amount of work spent to build it, and there will be ongoing maintenance and infrastructure costs. Maybe I'm too naive, but how does the Kroki team plan to make the product financially sustainable?