It’s funny you mention the office side of things in addition to gaming, because I have remarked about the same thing.

Using Librewolf(firefox) on Linux, all of the M365 applications work fine in the browser. Probably even better, since I can actually close them when I want to. I use Teams the most, which is obviously a very connected thing. But for a word processor, which seems like the most local thing ever, the web app lets me share in MS format and accept comments and all that.

I could absolutely see Microsoft’s execs planning out the most efficient way to grind every bit of value out of the windows brand on their path to subscription everything.