Problem with C# isn't the language, it's the enterprise ecosystem. You always feel like you're going to have to pay at some point down the road for using the tech.
Microsoft has been historically much less aggressive with lawyers compared to Oracle.
https://www.theregister.com/2025/05/09/users_advised_to_revi...
You can easily just not use the Oracle JDK, though, unless you're running commercial software which requires running on the Oracle runtime to get technical support.
As others have said, the problem is not the runtime, but libraries: many major .NET libraries have been going fully commercial, you can't really trust the ecosystem anymore.
They also tend to be of higher quality and provide better performance.
Moreover, a lot of these libraries are well-supported to this day. For example, Hibernate (the best ORM in business) is 28 years old, and has just released a new version. I recently consulted my former client (from 15 years ago), and I still recognized most parts of the stack that I set up way back then.