Ory is the largest open source community in the world for cloud software application security. We maintain advanced open source security software solving authentication, authorization, access control, application network security, and delegation. Ory implements a variety of industry and best-practice standards including OAuth 2.0 / OAuth 2.1, OpenID Connect, Zero Trust Networking, Google Zanzibar Policy Framework, FIDO2 U2F, WebAuthn, TOTP, and more.

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It looks like userset rewrites were partially implemented a couple of years ago:
<https://github.com/ory/keto/pull/877>

Is there any plan for completing that implementation?

Never mind - based on this doc I thought subject set rewrites aren't implemented yet
<https://www.ory.com/docs/keto/guides/expand-api-display-who-has-access#displaying-who-has-access>

But it looks like they are