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Microsoft is plugging more holes that let you use Windows 11 without an online account
(www.theverge.com)
This is a most excellent place for technology news and articles.
Forced SecureBoot with only MS keys and no way to install user-signed keys and no Linux shim would block non-Windows OSes from booting.
Basically, Pluton functions similar to how mobile devices function in terms of locked bootloaders.
AFAIK the only devices currently produced which actually use Pluton are Surface devices though, and if it's not being implemented as intended, it's just seen as a generic TPM by other OSes.
For anyone wondering what Pluton is: https://learn.microsoft.com/en-us/windows/security/hardware-security/pluton/microsoft-pluton-security-processor
Pluton as TPM: https://learn.microsoft.com/en-us/windows/security/hardware-security/pluton/pluton-as-tpm