You forgot the post-install step of asking everyone for their username/ID. It may sound stupid, but this is a huge barrier to entry for a lot of people. It's ha

You forgot the post-install step of asking everyone for their username/ID. It may sound stupid, but this is a huge barrier to entry for a lot of people. It's hard to build a network when you need to ask everyone 1. If they're on a service 2. What their ID is. With Signal, friends and family just have to install it and, bam, I'm already in their contact list, along with any new person who joins.