Aside from spam, a valid email address is a powerful tool and it is often the foundation on which many cyber-attacks are built. Fortunately there are several ways you can avoid giving your real email address out unnecessarily, and which allow you varying degrees of control over your information.
There is no country next door for Twitter users, and if they pack their virtual bags and decide to head North, they'll find no kingdom or republic willing to accept them - only floating island micro-states in the form of niche social networks such Mastodon, and other Fediverse servers.
The reason I haven't had time to explore Scrivener's many undoubtedly excellent features is that there isn't a functioning Linux version available. To me, this is bizarre - Literature & Latte created an employable beta many years ago, got it to the stage where it was actually usable and then abandoned it some time in 2011.