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It's not free if you use the binaries builded/downloaded from caddyserver.com. It's still free if you build the binaries yourself from source [0].

And there is a Docker Hub image freely licensed building from source: https://github.com/abiosoft/caddy-docker

Binaries from github should also be free, though they do not have external plugins compiled in.

Great! I didn't know about that.

Caddy is free. Caddy binaries are not free, which is different. You're free to build it yourselves (or use a prebuilt docker image).

Or just build Caddy from source?

their github source is still apache 2.0 licensed. just compile it yourself and you're good to go.