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.
Every large company I’ve ever worked at had a strict “no Microsoft on the server” policy and for better or worse, C# is closely identified with Microsoft.
The poster was talking about the ecosystem not the core platform. The wider Java ecosystem was heavily dominated by many Apache (and other) open source libraries vs commercial products for the C# ecosystem.
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.
Java has a strong history of OpenSource, and a great set of libraries. It also pioneered the managed dependency system early (Maven), so these libraries have been centrally available for two decades.
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.
