Google doesn't actually offer Zanzibar as a product/service (in GCP or otherwise) to customers. However, they do use it internally to manage permissions across their various products (Google Docs, Drive, YouTube, etc.) and have had a lot of success doing so. Because of that, there are many open source implementations of Zanzibar out there (as others have commented). Warrant also maintains our own open source implementation of Zanzibar[1] which powers our managed cloud offering, Warrant Cloud[2].

[1] https://github.com/warrant-dev/warrant

[2] https://warrant.dev

If you genuinely aren't trying to be snarky, then what was the point of this post? You clearly don't even know what Zanzibar is. If you were trying to find out more about it there would be hundreds of more useful questions to ask.

Yeah, it’s really frustrating when Google EOL’s a paper they published.

The actual implementation is closed source. The backing idea is described in the inaugural paper which third parties have used to build hosted and open source alternatives that you can try.

This tired trope has jumped the shark with this comment. Not only is it off topic, but even if it did refer to an actual Google product, it's disingenuous because its only point was to be snarky.