Ask HN: Is there a business in providing cloud-host for an open source tool?

I found an open source tool that doesn't provide a cloud-host solution, you need to install on your own server.

I think it may be a good business idea to provide a service where people pay to use it without worrying about installation, mantainence, updates, scalability, etc.

My question is not only if there is a market for that, but what about rights/licenses/exposing the original open source tool? The documentation should be replicated for my customers in how to use it? What about languages libraries? I should fork them?

Thank you very much.