while this is probably true, it entirely misses the point.

it's only true because a very, very small number of megacompanies consume huge amounts of servers; a more accurate number for this discussion would be server per company. Nearly every business larger than a few people has a need for a windows server (for basic filesharing and Domain authentication, not databases or custom apps) and a windows app for their business that can be filled nearly off-the-shelf.

the cost-benefit of trying to start a linux setup is not even close to worth it.

SMEs tend to buy cheap laptops, that come with "free" Windows Home. (I don't that that version can even be added to a domain) Then they start expanding and just stick with "what works", until it doesn't.

But I see this dropping drastically in the next decade, as PC replacements(read even cheaper Chromebooks and tablets) take more hold and web takes over even spreadsheets.