I bet there are more people knowing what Meta is than Signal or Telegram.

This sounds like a product idea to me. Make a website that shows the status of your friends that are willing to switch to signal. You send an invite to all your friends first so the list keeps up to date as soon as one of your friend made a decision. If everybody agreed you can switch as a whole. Even better if signal would implement it themself!

I bet more than 1% of Whatsapp users make use of their web interface and/or live location. Signal doesn't have either of these. Yes, you can install a Signal app on your computer, but not everyone wants to do this.

Also, that "everyone else" would have to include all business accounts, which I think would require Signal to build out an API

> I think 99% of WhatsApp users would gladly stop using WhatsApp and switch to something like Signal, if they had verbal agreements of "everyone else" that they would also switch.

Most users do not care. If you told them other users agreed to switch platforms, they’d be annoyed about having to learn a new app when they already had one that was set up and they knew how to use.

HN is part of a small bubble that doesn’t understand product management for common people. Average users do not care. They just want a product that works.