Closest option is watomatic but it only works with whatsapp and Facebook messenger. There are talks about expanding it to support other platforms

So the whole security and privacy claims are purely marketing.

Not correct. I have clients in their 60s who are using Fedora just for online shopping and the occasional document edit. Everything worked perfectly fine out of the box. Only had to tweak libraoffice to save in docx by default and that’s about it.