I had very high hopes for matrix because of the bridging capabilities but I was sorely disappointed after spending a couple hours to set it all up. Some of the bridges require violating the TOS for other applications, or going into the dev tools to copy cookies. Basically completely unapproachable for non-programmers. Once you have a bridge it's impossible to start a new chat with someone in another app. You need to start the chat in the other app, wait for the matrix bridge to be notified of the chat, and then you can continue the conversation in matrix.