It’s not that Microsoft isn’t allowed to use ffmpeg, it’s that they start demanding quick service.
I'm not sure what experience you have in maintaining any somewhat popular FLOSS project, but as I said in other posts the way random users demand features and fixes in these circles already became a meme in FLOSS circles. We're talking about insults and belligerent attitudes towards whole projects in abstract and maintainers in particular, to the point maintainers end up burning out and quitting.
Knowing this, complaining that a particular request was described as high-priority as if this was unacceptable, fully knowing that this doesn't even represent a remark that's out of line given the baseline, is something that makes no sense at all. It sounds as an lame attempt to be outraged about something.
Why do you believe that forcing something onto everyone around you is justifiable? I mean, if what you're pushing is half as good as what you're claiming it to be, wouldn't you be seeing people lining up to jump on the bandwagon?
It's strange how people push tools not based on technical merits and technological traits, but on fads and peer pressure.