[ummonk]

End-to-end encryption doesn't protect you from this, since any recipient can report illegal material to the authorities and trigger an investigation of the sender.

[ViViDboarder]

I’m that case, literally nothing will protect you from this. Any recipient can put anyone in any conversation.

[ummonk]

There can be TOR-like systems that with an ideal implementation make it impossible to obtain any metadata about the sender.

[ls15]

Agreed, ideally you have both, e2ee and no linked phone number.