Earlier quoted context omitted.
> Don't know if it can be used as a proper Docker replacement The readme says "I can make no guarantees that it won't trash your system", so yeah clearly not intended for real use.
Where does Docker guarantee that it won't trash your system? See here: https://www.docker.com/legal/docker-terms-service/ Under EXCLUSION OF WARRANTIES and LIMITATION OF LIABILITY. Here, Bocker is also a replacement for Docker in exactly the same sense: Bocker's simple statement "I can't guarantee it won't trash your system" is a concise alterantive to a wall of legalese.
You'd probably want to tread cautiously if someone doesn't use disclaimers - that's probably a more dangerous product.