Particularly as it does not include its own PKI, so E2EE is done by MITM your IdP (OICD/SAML etc) and therefore, under court order Tailscale can decrypt your traffic.

We took the opposite approach with NetFoundry. (1) We open sourced the code (https://openziti.io/), (2) we built in PKI with private keys generated at source and destination so that even if traversing NF hosted data plane, we CANNOT decrypt traffic, (3) mTLS everywhere, (4) ability to bring your own PKI, and more.