It's not, but decentralization isn't super effective for private channels of communication, particularly where neither end is running the software in question. (Most Mastodon users aren't site admins.)

But presumably if proving a Keybase user and a Mastodon user are the same is given, when a Mastodon user wants to contact another outside of Mastodon, Keybase Chat may be the new default choice.

i think that’s pretty incorrect tbh; xmpp/otr, and matrix handle federation and private chat/encryption just fine

id much prefer to see chat that’s just thinly wrapped in a pgp implementation that gets its keys from keybase (maybe just initial secrets transferred with pgp for handshake or something)

> but decentralization isn't super effective for private channels of communication

The two examples of that not being the case are OTR XMPP and PGP e-mail.

> particularly where neither end is running the software in question

You cannot have useful encrypted communication if your software does not support it.