There are big wishes for Signal to adopt the perfectly working Flatpak.
This will make Signal show up in the verified subsection of Flathub, it will improve trust, allow a central place for bug reports and support and ease maintenance.
Flatpak works on pretty much all Distros, including the ones covered by their current “Linux = Ubuntu” .deb repo.
To make a good decision, we need to have some statistics about who uses which package.
The worst part about signing up somewhere is the amount of email spam that will land in you inbox. I don’t know about their specific configuration, but by default Discourse (the forum software they use) sends weekly “digest emails” if you haven’t visited the site for a week. So make sure to turn them off.