Just pondering wordplays: Assume I implement a messenger, and I want to obtain full access to messages, but I also want to be able to put "end-to-end encrypted"

Just pondering wordplays: Assume I implement a messenger, and I want to obtain full access to messages, but I also want to be able to put "end-to-end encrypted" on my product. Couldn't I go ahead and encrypt everything with an encryption system where I know all the keys? It end-to-end encrypted, since your client encrypts and my client decryptys and hey, it might even be some good asymmetric encryption, but nothing matters as long as I don't disclose my key management or, even better, put all key management into your hands. And even worse, if I don't give my transmission servers access to these keys, "no intermediate node" has access to this information, because only secondary nodes have access to the information. It's a scary twist of words, but I dunno... I could probably convince a lot of standard users with such smoke and mirrors.