Matrix makes sense for private invite-based chats, but for that we have Signal. I think some of the DID/pseudonymity features Dorsey's AT protocol will be the best future bet for facilitating true desire and revealed preferences. Matrix feels a bit derivative, solving a problem too late for a community that may have aged out and dispersed. It would have been the best IRC/SILC alternative ever, if the culture still supported the interaction model of those prior techs.