The majority of computer owners on planet Earth
But also the majority of programmers?
Yes, because Windows software doesn't sprung into existence out of nowhere.
In AI-focused fields like business analytics and data science, yeah.
The claim is that people are running CUDA on Windows for business analytics and data science? This feels less likely an accurate picture and more likely any mass data processing is already happening on Linux K8s clusters.
Yes, if they happen to run tooling like Excel, PowerBI, Tableau,....
Also Linux support for CUDA on laptops, especially with dual GPU setup isn't particularly great.
Most workstation class laptops are Windows based.