Forgejo is in fact working on being decentralized, just like the underlying git structure is. There are some first federation things in there, but the full implementation is still pretty far out.

Oh that is good to know then. At a cursory glance I only saw the clients’ software available as github repositories and the German and French wikipedia pages called it a proprietary service.

Is there an open source implementation of kDrive as well?

I would assume (without having looked at the codebase) that if they use minio they are, by default, not reliant on AWS.

Minio is its own S3 implementation which can be self-hosted.

S3, being an AWS protocol originally has AWS environment variables all over the place but that does not necessarily mean a reliance on the service. Rather, they rely on the protocol and you bring your own S3 endpoint I would assume. be that minio, hetzner or what have you.