This is a good response.

I’ll add from an argument perspective, try to make Signal sound as similar to WhatsApp as you can, then highlight how it’s better.

Don’t bash WhatsApp, it’s an entrenched default (first man in advantage). At worst, highlight why you don’t support it. Humans love homeostasis, even if it’s not good for us (the devil you know) - ppl may actually like it and you have to convince them why your option is better.

Happy persuading!

Well, that shorthand just made it into the lexicon