Ten? So like Android and Linux flavors? I'm not sure I even know of ten: e/OS, Calyx, Lineage, Ubuntu Touch, eh is there like Mobian or something still alive... how do they get to ten?? Do they also all fully work? Camera and calling (and not only on 2G) for example?

I'd be interested in the list, the website you've linked is super sparse (the full menu is like shop, some feel-good pages about device deposit and impact, blog, and contact us - no knowledge base, documentation, or somewhere where you'd expect to find OS info or even downloads)