Telegram is not E2EE (with the exception of phone-only 1-on-1 Secret Chats, which are also questionable security-wise). Telegram has access to everything ever shared on their services, even if users delete it.
Signal by design can't moderate their service.
Telegram by design has full access, but doesn't act on it.
Signal by design can't moderate their service. Telegram by design has full access, but doesn't act on it.