TPM mandatory to run Win10?
No, it isn't. My PC can* run W10 but doesn't have TPM. I think you are getting confused with the MS requirement for NEW devices to have TPM as stated here:
"As of July 28, 2016, all new device models, lines or series must implement and be in compliance with the International Standard ISO/IEC 11889:2015 or the Trusted Computing Group TPM 2.0 Library and a component which implements the TPM 2.0 must be present and enabled by default from this effective date."
The above is taken from: https://docs.microsoft.com/en-us/windows-hardware/design/minimum/minimum-hardware-requirements-overview
Older devices can run W10 (if they must) even if they don't have TPM.
*It doesn't actually have W10 on it at the moment - I am not that stupid! However, I do have an SSD in my desk drawer that has W10 installed (upgraded for free about 2 years ago from a clone of my W7 install) for when W7 goes end of life. Once every so often I put that SSD into my PC just so it can update itself to the latest horror-filled TITSUP version. Then I put it back in the drawer and carry on using W7.
Biting the hand that feeds IT
