What "backdoor" would Let's Encrypt even implement? That's not how a CA works.
They might be compelled to issue a certificate to an unauthorized (by browser PKI policies, not local law) entity, but that would be very conspicuous due to Certificate Transparency.
They might be compelled to issue a certificate to an unauthorized (by browser PKI policies, not local law) entity, but that would be very conspicuous due to Certificate Transparency.