This is a convenience feature in Outlook that is enabled only if you have a Teams licence, specifically that when you create a meeting in Outlook, it sets it as an online meeting.
You can turn this off, but last I checked can also set it to stuff like Google Meet, Zoom, WebEx, Facetime, etc if you have the relevant plug-in for Outlook.
Any company that has compliance requirements to keep devices supported with security updates, it's the same as Win 7 to Win 10; you either update everyone to Win 11 or you pay for the security updates for Win 10 (IIRC you have 3 years to update before you can't pay anymore). Many will likely already be on Win 11 as the upgrade path is easier/quicker than Win 7 to 10.
Also they will not have the gunk installed anyway as they will almost certainly have Windows Enterprise which has more policies that can be set, and then they will also be ordering devices from an OEM or distributor that doesn't have the junk included.
Heck, if they aren't doing Autopilot from the OEM or distributor, they will almost certainly be applying their own Windows image.