Ory Polis also sounds great, but also suffers from:

Organizations that require advanced features, enhanced security, and enterprise-grade support for Ory's identity and access management solutions benefit from the Ory Enterprise License (OEL) as a self-hosted, premium offering including: Additional features not available in the open-source version, Regular releases that address CVEs and security vulnerabilities, with strict SLAs for patching based on severity, Support for advanced scaling and multi-tenancy features.