Federation is not some sort of magic dust that would fix signal, you'd be just exchanging one problem (centralization) with another (spam). Plus in all likelih

Federation is not some sort of magic dust that would fix signal, you'd be just exchanging one problem (centralization) with another (spam). Plus in all likelihood even if they did federate, it would just be like email with gmail that the Open Whisper Systems is the dominant player so most conversations have at least one party running on Moxie's hardware.