> ensure that the basic functionalities of instant messaging services are interoperable, i.e. enable users to exchange messages, send voice messages or files ac

> ensure that the basic functionalities of instant messaging services are interoperable, i.e. enable users to exchange messages, send voice messages or files across messaging apps I am not a cryptography expert, but doesn’t this requirement make it more difficult to have end-to-end encryption unless users take key exchange into their own hands?