>And maybe tiobe have some relations, bias towards MS?

Maybe, but both environments, VB.NET or C#, are a property of Microsoft.

>In other sources, case is different. For example, SO surveys list Python and Go in top 5 loved and wanted languages, while VB.Net is listed in top 5 dreaded.
>Tiobe shows Dart in second 25. But as Flutter is rising, Dart is rising as well, people seldom do make searches using keyword "Dart" while result would mainly contain Dart code.

That is good to know.