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ZeroVer is satire [1].

...and so it's explicit... the homepage's table of projects is a Wall of Shame.

Thank you... I couldn't understand the reason to use it.

It's so you can tell your users that the bugs aren't going to be fixed yet. It'll be ready by v1.

and you can break the api anytime

I would say that it is more about avoiding to promise anything about API stability between versions.