I think C# has the highest ratio of (happy) programmers to internet discussions, at least among mainstream languages. This makes it look a lot less popular and cool for people outside the ecosystem.
I think that it's also much more common with companies that aren't primarily tech-focused, as those companies usually have cosy relationships with Microsoft. Pure tech companies, startups and FAANGs don't seem to use it much.
This also ties into geography. In the US, far more people work for startups, FAANGs and pure tech companies than in Europe, where traditional businesses and "software houses" are far more prevalent, which means there's far more C# there.
I think that it's also much more common with companies that aren't primarily tech-focused, as those companies usually have cosy relationships with Microsoft. Pure tech companies, startups and FAANGs don't seem to use it much.
This also ties into geography. In the US, far more people work for startups, FAANGs and pure tech companies than in Europe, where traditional businesses and "software houses" are far more prevalent, which means there's far more C# there.