XMPP

it should be abandoned by anyone who cares about these things. Not only does it leak a fuckton of metadata by default, there is a global censorship blocklist ran by a single person ( see xmppbl ) named jonas, which is implemented by a large portion of servers on the network and supposedly many clients, though i havent verified which clients implement it yet. for a "decentralized" network, there should not be a central authority that gets to decide who can interact with fellow users or other servers. The creator also actively tries to hide the fact that he is behind the service, and makes no mention of it on his XMPP wiki page. if this doesnt scream "ill intent" already, i dont know what does. previous chat logs proves that he runs it. the person also runs the jabber chat room search engine which has a history of censoring MUCs. To mitigate against this threat, its recommended to use darknet federation wherever possible. In an ideal scenario, like minded individuals would leave XMPP and opt for better alternatives, such as self hosting their own ircd over TOR and I2P, or using truly decentralized peer 2 peer protocols.