After four years, perhaps all new motherboards have a TPM microchip.
Sooner than that. https://docs.microsoft.com/en-us/win...ecommendations
I quote:
Windows 10 for desktop editions (Home, Pro, Enterprise, and Education)
Since July 28, 2016, all new device models, lines or series (or if you are updating the hardware configuration of an existing model, line or series with a major update, such as CPU, graphic cards) must implement and enable by default TPM 2.0 (details in section 3.7 of the Minimum hardware requirements page). The requirement to enable TPM 2.0 only applies to the manufacturing of new devices. For TPM recommendations for specific Windows features, see TPM and Windows Features.
I'm not sure about the other device security requirements for Windows 11. I believe that Secure Boot was a requirement for Windows 10 from the first. UEFI motherboard are about 10 years old or older.
I think that if you bought a PC (or motherboard) in the past 5 years that was certified for Windows 10, it may meet every requirement for Windows 11, except for the CPU. It'll be interesting to see whether the current CPU list holds. Or, whether MS backs off completely and allow 11 to be installed on machines that don't meet their hardware security requirements. (Just like for 10.)