Matt Miller, Project Leader of #Fedora, gives a nice overview of what makes #distros valuable. This applies to any distro that actually reviews the packages that they ship, including #FDroid #Debian etc. Something like #Flathub or #Obtainium do not behave like distros because they do not aim to review and standardize the packages they ship.
https://inv.nadeko.net/watch?v=oKP1hgdFJKo&t=187
(You can click "Watch on YouTube" from that site if you like that kind of thing 😉)
#Google #Chromebook has a good reputation for #security. They let any user install a #Debian container where you can then install anything from Debian, even add Flathub or directly install downloaded .deb packages. All of this without anything like the #AndroidDeveloperVerification requirements.
https://www.howtogeek.com/how-to-install-and-use-linux-apps-on-a-chromebook/