Look up the Microsoft Community/Open Specification Promise and their patent promise https://github.com/dotnet/runtime/blob/main/PATENTS.TXT https://github.com/d

Look up the Microsoft Community/Open Specification Promise and their patent promise https://github.com/dotnet/runtime/blob/main/PATENTS.TXT https://github.com/dotnet/runtime/blob/main/PATENTS.TXT .NET Core is open source, free, and comes with the guarantee of no litigation from Microsoft. As far as the ecosystem, it fully embraces open source too. At my company, all .net libraries we use are free and open (AWS, Consul, Elasticsearch, EventStore, Kubernetes, etc).