In the 90's that situation was flipped: it was the desktop side that was stronger and the server side weaker. This was mainly because it was a bunch of hackers

In the 90's that situation was flipped: it was the desktop side that was stronger and the server side weaker. This was mainly because it was a bunch of hackers making the system they wanted for themselves. But then businesses started being built on Linux pouring money into server-side development (adding features, fixing bugs, improving performance etc.) and many of the hobbyists decided it was time to get paid for their efforts. So you end up where we are today.