It's easy to have multiple chat apps in parallel though, each with their own network.
Ads will make more people Signal-curious, or even drive people back to text messages. The average person who switches will convince a non-zero number of their contacts to come with them. The shift will start gradually. Think of Skype, which at one point everyone I knew was on. That network didn't protect them from being replaced by competitors.
People are also increasingly worried about retaliation from the government for their supposedly free speech, which has already driven a few people I know to secure alternatives that aren't operated by Trump allies.
Ads will make more people Signal-curious, or even drive people back to text messages. The average person who switches will convince a non-zero number of their contacts to come with them. The shift will start gradually. Think of Skype, which at one point everyone I knew was on. That network didn't protect them from being replaced by competitors.
People are also increasingly worried about retaliation from the government for their supposedly free speech, which has already driven a few people I know to secure alternatives that aren't operated by Trump allies.