What's Linux's market share compared to the rest? From there compute the profit margins left after you subtract the amount of issues and support tickets the Linux userbase will generate in relative to the amount of sales and revenue. Chances are you're not breaking even.
Meanwhile Google wouldn't need to provide support for Chrome on Windows ARM(or any other platform) since it's not a commercial product consumers pay money for and are entitled to support, it's just a free product shipped withotu warranty financed by vacuuming your personal data.
Your argument is that office is not on Linux because the user base is too small and not worth the support burden.
The parents argument is that Linux's user base is smaller because critical applications like office are not available there.
These arguments are not mutually exclusive. Microsoft would rather keep it's dominate windows market share _and_ have less support burden.
On the other hand, Steam making Linux work well is a massive support burden for a smaller user base, but it prevented os vendor lock in for their platform.
Decisions to release or not release software is not so easily distilled to single metrics such as support burden.
Not worth the trouble of 2% userbase, they can use the Web version, it is like the Electron apps most people swear by on GNU/Linux, with advantage there is nothing to instal besides their favourite browser.
Most them seem quite happy to use Google Docs, so Microsoft Office 365 should also be alright.
The Web Version sucks badly though.
Even the most basic features like using your corporate/university PowerPoint Template won't work (with an active 365 Subscription)
