I've relicensed it from source-available to full MIT — so anyone can now self-host it, fork it, modify it, and run it however they like, no restrictions.
I've also retired the managed/hosted tier — there's no paid version anymore. It's just the open-source server now.
Want to try it without setting anything up first? You can spin up a free, throwaway Flarum with MCP already wired in on the sandbox — a real install you can build and test against in about a minute, then throw away.
Everything's on GitHub (or pull the Docker image). Issues and PRs welcome.