We need better rules to make digital markets open and contestable

It would be great if social networks and messaging apps were interoperable, but there are going to be some difficult questions about how that can be done securely.

For example, Facebook years ago added support for sending PGP encrypted emails to users[0], so in theory they should be able to allow users to publish their Facebook posts to non-Facebook users using that same open standard. They could even be forced to add Delta Chat[1] compatibility to (Facebook) Messenger.

[0] https://www.theguardian.com/technology/2015/jun/01/facebook-...

[1] https://delta.chat/en/