If e2e encryption is backdoored, there are no safeguards. If a court can read the data, then any "encryption" is privacy theater: either the key has been leaked and stored on government-controlled servers (which means an adversary who got access to the government-controlled servers could read your data without your knowledge too), or the e2e encryption is entirely fake and there's a plaintext copy stored somewhere that, similarly, adversaries could access. If the government can read all of your data, a hacker can too — which in today's age, also includes foreign (or even domestic!) government surveillance programs.
Backdoored encryption isn't real encryption. It's theater.