Abuse of monopoly position.
I have to say, If I was running a small business and MS comes along and tells me that my 2 year old PC's are all obsolete and will no longer be supported in 3 years time.
This would be the thing that pushes me over to Linux.
As a private user, but for the games, (And a handful; of proprietary programs that I use) I would have probably jumped ship already.
Not so bothered about the TPM/secure boot thing so much (Though the future implications are disturbing)
But not being able to use a rather expensive CPU that I only bought 2 years ago is outrageous! (AMD Threadripper)
Its almost like a monopoly electricity company suddenly changing the supply voltage in a way that 90% of appliances, even ones a year or two old, cannot use and then telling its customers to just suck it up!
MS should not have the right to obsolete billions of dollar worth of computer equipment around the world on a whim. The overwhelming majority of which works just fine.
(How many billions? I can not begin to imagine. 10's, 100's. More even perhaps. It isn't just home PC's, its industrial and medical equipment too)
Perhaps the US government should do a standard oil job on MS and break it up!