I know what you mean, but it's not what you said. :-)

Just wanted to point out that they still have monopoly on the enterprise side of organization infrastructure, which is huge - the number of companies running production systems on self-hosted Linux infrastructure are orders of magnitude fewer than those that don't, even if the number of Windows servers in total might be fewer.

Microsoft gets paid per employee, per application suite and per cloud service (if Azure is involved for the AD) - not only per server. They were very early on the recurring subscription model almost every SaaS provider is leaning into nowadays, even for on-prem stuff.