A bit underhanded, given the text from the bulletin.

"Once this feature has rolled out, your end users can change their search engine preferences only via the toggle in the extension; they cannot modify the default search engine in browser preferences."

I was an IT admin for a company of 100 people. If you mess with employee's browsers or browser layouts or search functionality, you are going to get a LOT of angry users. Furthermore, Microsoft is forcing companies who do not want this functionality to take evasive action to prevent this from happening. It's not the fact that this functionality is useful or the fact that this functionality isn't evil thats making people angry. Its the fact that they are forcing changes on people that people may not want or need. That is user hostile behavior.

If you use your work Office 365 licenses on your personal machine (as is heavily encouraged in Education since you get 5 BYOD devices), this will automatically install when your machine is updated to 2002, and IT can't do anything about it since they don't manage your personal laptop.

It's not just Enterprise. Plenty of small businesses use Office 365 as well. They don't all have on-site IT staff, and they often don't have competent IT consultants who keep an eye on this stuff.