Yeah, the original motivation was the shutdown of the blabber.im service. It's not the first time a service has shut down without adequate data export/migration options, so my goal was to make something server-independent to fill that gap. It lets you download your data as a file, as well as migrating to a new server.

You can search most XMPP chats via https://search.jabber.network/ - the XMPP Standards Foundation also hosts some chats aimed at XMPP developers and operators: https://xmpp.org/community/chat/