Perhaps but finally it is not sexy for the ones who want to communicate. In an ocean of spam, fake, bots, do you think they could be mass adoption ? The email have been spam because his usage was enough to be financially interesting for spammer. I am not sure newbies here would be happy to have experience with spam bots directly without any advises or warn before. Because you know how to do "mute", choose relay... But a new user will ignore all this. So perhaps because of this it will stay a network of geek. 🧐