But corps are running Linux, in that sense that basically every serious web application is running on a Linux backend. Even if you use IaaS.
Basically, companies that are "in the know" and develop software utilize linux as much as they reasonably can. Companies that aren't, don't, but do "use it" kind of transitively through their software.
Where Linux does not hold is in Corporate Desktop IT. Mostly because of inertia of all things. MBAs need their Excel, and let's be honest. These people just... do not learn new tools. They certainly have the ability, but the culture is such that they just don't. So it's not even a choice really. No Windows = No Excel = No serious business person is okay with this.
Maybe, maybe, if your company is mostly developers then you can swing desktop IT linux. But your IT department will fight you, yes they will. And HR will be pissed. And I sure hope your CEO is also a developer. If he's a business guy, well... boss baby needs his Excel. How's he gonna do anything without Excel.
Our dev arm (me included) do use Linux VDI. But most day-to-day business are done in Microsoft's ecosystem (Teams, SharePoint, Office, Copilot, etc). In the industry I am in, you would never be able to use any AI tools unless the trusted platforms offer them as part of their products (i.e. Microsoft's Copilot or Amazon's Bedrock) because InfoSec and Legal departments won't risk authorizing any other providers.
It's irrelevant the reason why, the margin any business can take will be constrained by the cost to switch to a cheaper, good enough, competitor.
You are saying it's difficult to switch due to compliance and admin issues. Ok!
LLMs can be swapped easily and open weight models can be hosted to adhere to whatever legal, uptime requirements etc are needed trivially.
The big cloud providers already host and resell open weight models.
The two don't event compare