Glad you're liking it!

I've been working on simplified hosting for nixosConfigurations; likely I'll launch paid plans along with that, since otherwise costs will be too high for me to shoulder, and anyhow free hosting leads to abuse or the moral hazard of accidentally using too many resources. I still have some hope for a donation-based system for individuals, and paid plans for companies, though.

I do think about open-sourcing it as well. I've been thinking about a license that would require only running it (and derived software) on green energy; that way, if competition were to arise, cheaper/dirtier energy wouldn't be what we would be competing on. But figuring out whether that's plausible, and what the consequences of the decision would be, is hard!