[jayd16]

There is a huge amount of closed source, ecommerce shops that use C#. Its popular in game dev too but TIOBE is probably attributable to the ecommerce.

If you know Java, you should give C# a try. Its a slicker Java with some good decisions that actually make it viable for a lot of things Java struggles at, like better interop with pointers and things like native UI (Maybe Loom will eventually overtake async/await for UI dev but not quite yet).

It works very well on many more use cases than it used to. .NET has followed with the Linux servers in the cloud industry reality and is very stable.

Its just a good language. Try it out.