(Also, they sign up for mailing lists all the time, often whether they want to or not because everybody wants you to be on their damn mailing list. Email is absolutely still a viable broadcast medium, despite all the pundits declaring "email is dead" before they go back to, you know, checking their email.)
Yes exactly. The difference is that you live in the us where you grew up with the concept of an information superhighway in the 90s. In most of the world the internet as websites never existed, it arrived with smartphones and thus social media apps and by extension some other apps. The things you mention were all done in person or via messaging apps until other apps were introduced. Actually most of the world still does those things in person or via WhatsApp. Well of course not Facebook, LinkedIn or online banking because they arrived with smartphones too.
That's not necessarily the endorsement you think it is.
But that's not the end results. Senators have youtube channels, representative posts tweets and even tiktoks to update people, and emergency broadcasts post on Facebook. I'm not opposed to the expanded reach, but when that's their only official channel, it feels like something failed.
Recent years have only now made some non-US entities be pushed to start building away from this dependency, but it's a shame it had to get this far ingrained to begin with.