[parliament32]

I feel like this would go about as well as BBM's Android release a few years back. Non-iphone users would use it for a bit then switch back off as the novelty of "yet another ecosystem messaging app" wears off.

The proper way to do this is to convince people to switch to an app that integrates other messaging platforms as well: people switch to Signal and stay on it because they send all their normal SMSes run though the app as well. Then as their friends switch to Signal their conversations are painlessly migrated, everything looks the same, you just get a bonus "lock" icon.