Don't get me wrong I love Hetzner and their cloud offering and I think they're doing a fantastic job, but it is not comparable to platforms like AWS, Azure or GCP. It's good enough for simple use cases but I think most large companies that want to switch from on-premise would have a hard time adopting it since so many crucial features are missing.
The LIDL cloud will have the same problem I think: They will probably build it on top of OpenStack or Kubernetes but will never reach feature parity with AWS, Azure or GCP. I think in their niche (retailing, logistics) they might be able to get some good adoption if they offer specific services and infrastructure based on their own use cases and experience, but this isn't really competition for AWS, at least not in the broader sense.