People who knows well about FB, has awareness of privacy, who never believe whatever sh!t gets forwarded in WA & FB already moved to Signal, sum of which comes to around 0.1% of population. But there are a whole lot of people (almost balance 99.9% of population) who believe all the stupid WA and FB forwards. These people are the asset of FB and burden for us -- the privacy conscious people, since more than 60% of our friends & family comes in this category only. Looks like, we have to continue our stupid old school / college & family chat groups in WA only.
WA has cunningly started this public privacy change announcement after getting all important cos to WA Business. Why won't the Businesses join them? It doesn't cost much money and cheaper than sending details using bulk sms service. Yes, stopping bulk sms in few years, is in the future plan for the businesses and that's where WA / FB Devil signed the deal successfully. Signal is too small to convince those businesses.
Moving to Signal will not change much. But leaving FB and IG accounts will have better results. I have deactivated FB account some 5 years back and never have IG account. Going to close WA in one of my number. The real problem will be when stupid businesses asks for WA numbers for sending non encrypted e-tickets and OTPs. In most of those cases, we can ask them to send via e-mail, saying no WA number (by using the mobile number without WA account).
But sadly, by that time - even few of the privacy conscious people will be ready to sacrifice privacy for the convenience and ready to deal with the Devil.