Think about it. It'd be pretty easy to get everyone's email or phone numbers. Then sign them up with an app and start notifying everyone on the mailing/call list on XX date. The only legal hurdle is that it can't be initiated by an outside party, it has to come from within. And the other big hurdle is big tech not allowing them on the app stores. Then it would be as easy as just creating a website.
Think about it. It'd be pretty easy to get everyone's email or phone numbers. Then sign them up with an app and start notifying everyone on the mailing/call list on XX date.
The only legal hurdle is that it can't be initiated by an outside party, it has to come from within.
And the other big hurdle is big tech not allowing them on the app stores. Then it would be as easy as just creating a website.