> On-premise, open-source, customer-owned remote attestation servers are possible. Avoid outsourcing integrity verification to 3rd-party clouds.
With owner-operated OSS MDM & attestation servers, PCs can have diverse, owner-customized OS and configs, reducing monoculture binary blobs.
...which won't be able to interact with any of the walled gardens which will be enabled by these same technologies.
Walled gardens care about including their large customers, so it's not as simple as locking them out. There is also an ongoing EU legislative effort to mandate digital platform interoperability, which will likely apply to attestation.
Attestation can also be entirely local, e.g. between a device and a USB key with OSS software that is configured by the owner.
Why can't there be a "local attestation server" equivalent to Lets Encrypt, e.g. offering the Top 10 most-requested OS configurations which are not being addressed by digital overlords?
Cryptographer priests are scarce, but not numerically capped or fully monopolized by digital overlords.