Local Stack Archived their GitHub repo and requires an account to run

https://github.com/localstack/localstack

GitHub - localstack/localstack: 💻 A fully functional local AWS cloud stack. Develop and test your cloud & Serverless apps offline

💻 A fully functional local AWS cloud stack. Develop and test your cloud & Serverless apps offline - localstack/localstack

GitHub

More reason to run your infrastructure using open source software in your own datacenter. OpenStack has been around for closing in on two decades, running clouds and being mostly governance-drama-free.

It's not surprising that a proprietary ecosystem built on open source software locked up behind a gate doesn't make a worthwhile ecosystem for building open source tooling against.

Running OpenStack for this is a massive project cost compared to spinning up a few local services, and the operational mess is on a different planet from "I need to fake a handful of API calls on my laptop". Self-hosting still means updates, drivers, and k8s/OpenStack glue code. Nobody sane are doing that for local dev, use Minikube or Podman if you want DIY and still like weekends.
OpenStack is one of the most complicated platforms in existence and finding suitably talented admins is very hard.