No, Intel SGX provides something called "remote attestation" which you can think of Intel signing a message saying "This specific program, generated this specific value when run in a secure enclave". So if that program (which you verify matches, and doesn't log) generated a public key. You know you can now communicate with that program in a way no one else can intercept the messages.
The two immediately obvious pitfalls:
a) Intel could potentially be compelled into signing a false-attestation.
b) There's security vulnerabilities in SGX which nullify their guarantees (which has happened several times before).
Either way though, Intel has probably invested billions (?) into their secure computing so they would be extremely unhappy to see their guarantees fail in the wild.
Is it possible to avoid using Intel's Attestation Service? (since that requires registering with Intel and so on as far as I understand how it works.)
Am I the only one who noticed that their website is down for 2 days now?
I don't know if it's 2 days already (last time I checked the website was a couple days ago), but at least for the past several hours both their regular and the .onion site have been down for some reason.
If it's actually been down for 2 days, then that doesn't sound good, as ChipMixer hasn't posted any info, nor has he logged into his account in the past 24h.